I took out a contract with Capricorn branch

I took out a contract with Capricorn branch. The contract was for both my son and I. We have both been to the gym and yet when my son wanted to go to gym, they informed me that he was too young. Furthermore, their customer service is non existent. I'm still waiting on the sales manager to return my call. It's absolutely disgusting! Rohan at the front desk kept saying the manager would call me back and yet he never has. Furthermore, I had sales consultants offering me contracts whereas I was already locked into this contract! I want this contract cancelled. The only reason why I took it out was for my son as part of his Christmas gift.