Retro Fitness review: personal training

I thought I had signed up for a 6 month personal trainer membership but after a few weeks I noticed I had been signed up for one year. I went straight back and my trainer said he would change it to 6 months. Towards the end of the 6 months I injured myself badly in the gym and couldn't go for the last two months. The month after I finished I still get a bill for personal training. I go back and my trainer who doesn't work there any more, never fixed the contract back to 6 months! The in-your-face meat head manager says there is nothing he can do and I have to keep paying a total cost of $2000! What a shakedown.