disgusting service

Yesterday i received my game statement requesting that i must pay R57, and i don't understand what for because the account was paid off on the 03 May 2015 and when i was going through my account there's an interest of R104.89 charged on the 10th of May 2015 and R2.00 insurance fees , WHY AM I BEING CHARGED INTEREST WHEN THE ACCOUNT IS ON ZERO AND THE INSURANCE FEES WHAT FOR BECAUSE THE ACCOUNT IS ON ZERO.<br> <br> <br> I WANT SOMEONE TO SORT THIS OUT AND CLOSE OFF THE ACCOUNT I DON'T WANT IT ANYMORE.