An increase on an account iam not using

I emailed virgin active to inquiring about the account i am paying but not using i wanted to move it to Hatfield but i was told it more than what i expected, then they gave me an option of using it on off peak times but this was for Midrand, i dint take the offer as why would i take a 340 off peak time when i have 260 peak times this month an amount was debited and no one told me as to why this amount went up. i am not using it because i moved so meaning i am paying for nothing which is the choice i took, but i would like it if people explain everything when u take a contract