Virgin Active Incorrect Charges and Avoiding Refunding Me

I pay membership for my whole family. You would think 4 contracts would afford me some decent customer treatment. Virgin Active debited my account with a ridiculous amount for one of the contracts. This happened even after I had alerted them of the issue and they had acknowledged that one of the memberships was incorrectly loaded on their system. I'm supposed to get refunded or at the least get the correct amount debited but they're giving me the run-around. I just keep getting the standard "we've raised the issue with management". Frustrating!