Law Advice Needed

I ended up signing up to a gym for a year, thinking it was for a month, and now I want to back out; it's quite expensive. They are saying they will get their law team on me if I don't pay up. My friend and his friend who works in a law firm are saying they most likely won't pursue me, cos it's £1200 overall for the year, which isn't much to them especially compared to the law fees they'd have to pay, however since they're with a contract group called Harlands I think otherwise. Some say they will say they'll get their legal team on me as a scare tactic, and it's making me extremely nervous and anxious.

Do you guys think I should try and just not use it? Or do you think I should just suck it up and pay them and use that gym?