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Thank you for requesting me. I am sorry to hear that this happened.
If they sue you they will likely win and the reason why is that you didn't give them an opportunity to rectify the situation. Had you been given a new trainer and still found that you were not getting what you paid for that would have been a different matter but the law is that you have a duty to mitigate your damages and so do they and you didn't allow this to happen.
It may be that they won't bother suing you given the complaint you made and their concern that they will lose in court but there is a lot of money here and my guess is they will send this to a collection agency who will harm your credit rating and who will then sue you after harassing you for a while.
I wish I had better news for you.
But you won't win in Court and they will counter-claim and you will end up losing and having to pay their legal costs.
You didn't let them try and rectify the situation and they offered to give you a new trainer and two free sessions so I just don't think you have much of a chance of winning at all.