Ultra Body Fitness – scamming minors at trufit gym at mission tx.

This is concerning my son who was scammed by a trainer named "Nino" in Mission Tx Trufit gym. Nino whorks for an independent company: Ultra Body Fitness. He told my son that he can try out the 1 month program for 168 usd and my son accepted to do it only for one month, he never mentioned a 12 month contract. Then Nino took my son's electronic signature from an ipad and pasted it to a 12 month contract! The trainer Nino is not taking responsability. After I asked for a contract (because he never signed one) I was given a sheet where my son's signature was electronically pasted on the paper. I would have never agreed to a 12 month personal trainer and my credit card is been charged for 168 usd for second time. I googled and found more complains about this trainer Nino. He has done this before to other people. He needs to stop. I been trying to contact corporate, or the district area manager Joel Matos but I don't have any answer. I really need help with this.