(CNN) -- The conversion therapy center being sued by gay men who paid the counselors to make them straight vowed it would continue to "assist those with unwanted same-sex attractions."
"The lawsuit is without merit, and is designed to create a chilling effect upon speech and programs that assist people in overcoming unwanted same-sex attractions," a statement from JONAH -- Jews Offering New Alternatives for Healing -- said Thursday.
Four former JONAH clients, who were teens when they signed up for help, filed a consumer fraud lawsuit against JONAH and two of its counselors Tuesday, saying they were defrauded by JONAH's claim that "being gay is a mental disorder" that could be reversed by conversion therapy -- "a position rejected by the American Psychiatric Association four decades ago," the lawsuit said.
"This is the first time that plaintiffs have sought to hold conversion therapists liable in a court of law," said Samuel Wolfe, a lawyer with the Southern Poverty Law Center. The SPLC, an Alabama-based civil rights group, is providing legal aid to the plaintiffs.
Their lawsuit should put all conversion therapists on notice that they can be held accountable, Wolfe said.
The SPLC has identified 70 conversion therapy providers across the United States. A California law signed by Gov. Jerry Brown last month made it illegal for licensed counselors to use the therapy with clients under 18.
JONAH co-director Arthur Goldberg said the position that people's sexual orientation can be changed by therapy is not contradicted by the latest statements from the American Psychiatric Association, but he did not give any examples.
"We remain steadfast in our commitment to assist those with unwanted same-sex attractions," Goldberg said in a statement to CNN Thursday. "There are thousands of people who have shed their unwanted same-sex attractions, not only through our programs, but also through other similar programs."
In an interview Thursday with the Family Research Council's Washington Watch Radio, Goldberg said he was optimistic that JONAH has "a very strong case and we should be able to emerge victorious."
The lawsuit, filed in Hudson County, New Jersey, Superior Court, said conversion therapy, which can cost up to $10,000 a year, can put patients at risk of "depression, anxiety and self-destructive behavior," while giving them no benefits.
Plaintiff Sheldon Bruck was 17 when he sought Goldberg's help in 2009. He wanted to assure his orthodox Jewish parents there was a way out of homosexuality when he told them he was gay.
Goldberg promised Bruck that "JONAH could help him change his orientation from gay to straight," the suit said.
Jo Bruck, Sheldon's mother, and Bella Levin, the mother of plaintiff Chaim Levin, are also plaintiffs because they paid for their sons' conversion therapy and the counseling the suit said they needed to recover from it.
The conversion therapy techniques described in the suit included having them strip naked in group sessions, cuddling and intimate holding of others of the same sex, violently beating an effigy of their mothers with a tennis racket, visiting bath houses "in order to be nude with father figures," and being "subjected to ridicule as 'faggots' and 'homos' in mock locker room scenarios."
"As long as you put in the effort, you're going to change," Goldberg told Bruck, the lawsuit said.
JONAH counselor Thaddeus Heffner blamed Bruck's gay orientation "on Bruck for not working hard enough to change, on his father for being too distant, and on his mother for being too close to him," the suit said.
Bruck quit after five sessions, delivered through an online video link, because he "experienced deepening depression and anxiety leading to suicidal ideation and feelings of hopelessness about his life," the suit said.
Heffner angrily warned Bruck that he was "making a big mistake" and "throwing (his) life away" by "giving into (his) desires" and that he would "never lead a happy life," but would "lead a life of unhappiness in that unhealthy lifestyle," the suit said.
Chaim Levin, also an orthodox Jew, was about to turn 17 in 2007 when he talked to his parents about his sexual orientation and sexual abuse when he was younger. A rabbi in his Brooklyn, New York, community suggested to his parents that they enroll him in JONAH's program.
"You can change if you just try hard enough," the suit said Goldberg told him. "You just need to work really hard, we are experts at this. We have helped so many people."
Levin attended weekly sessions for 18 months at JONAH's Jersey City, New Jersey, headquarters conducted by Alan Downing, an unlicensed JONAH counselor who calls himself a "life coach," the suit said. Downing is named as a defendant in the case.
"I was manipulated into believing that I could change my sexual orientation, but instead I was subjected to terrible abuse that mirrored the traumatic assault that I experienced as a young person," Levin said at a news conference Tuesday. "What I can tell you is that conversion therapy does not work. My family and I have wasted thousands of dollars and many hours on this scam."
The lawsuit described what happened in one of those sessions in October 2008 with Levin, who was 18 at the time.
"Downing initiated a discussion about Levin's body and instructed Levin to stand in front of a full-length mirror and hold a staff," the suit said. "Downing directed Levin to say one negative thing about himself, remove an article of clothing, then repeat the process. Although Levin protested and expressed discomfort, at Downing's insistence, Levin submitted and continued until he was fully naked. Downing then instructed Levin to touch his penis and then his buttocks. Levin, unsure what to do but trusting in and relying on Downing, followed the instructions, upon which Downing said 'good' and the session ended."
Two other plaintiffs -- Benjamin Unger and Michael Ferguson -- described similar incidents in the suit.
"On one occasion, Downing instructed Unger to beat an effigy of his mother with a tennis racket, as though killing her, and encouraged Unger to scream at his mother while beating her effigy," the suit said.
"Conversion therapy was, in Unger's experience, 'psychological abuse,'" it said. "By the time he terminated sessions with JONAH, he was deeply depressed and had commenced taking antidepressant medications."
Downing "picked apart every human emotion and childhood disappointment" of Unger, to present them as treatable origins of Unger's orientation, the suit said.
"I watched as grown men were frenzied into fits of emotional rage against their mothers and encouraged to act out physical violence against their parents in order to access their so-called true manhood and become more heterosexual," Ferguson told reporters Tuesday.
Unger's ability to have physical and emotional relationships with men was impaired and he was unable to work for a year, the suit said.
Bruck, Levin, Unger and Ferguson are "adjusting well" four years after their last conversion therapy treatments, according to Wolfe. "They have had time to get on with their lives," he said.