Incorrect billing

Every month I pay a bit extra and round if to the closest amount when paying IEMAS, for the past 2 months I have received SMSs stating that I still owe them money. I called in on both occasions I someone from credit control said that they would balance out my account. Now I receive my statement and they are double billing me for admin charges and \Change of account\".<br> My installments has also now shot up by an extra R300.<br> <br> I previously had a similar issue where I had to get my name cleared by the credit bureau"