Anytime Fitness

My girlfriend signed me up for an anytime fitness membership. I went on the 3rd business day to cancel it because the contract said you could and they wouldn’t let me. In the contract it says to buy out you can pay $250. The manager Heather said it would be 375. She’s clearly trying to get money out of me. My gf initialed her name on the contract and didn’t even spell my name right. I never read the contract but even if I did they are not honoring it. I just want out of it.