CellC SP - Customer (DON'T) Care department

December 2015 - acounting error from CellC SP, advised them via e-mail and by calling Customer Service. Up to today through various monthly mails and calls to Customer Service, Contract Department, Legal Department (no answer on this line) there has been ZERO response from Cell C SP to sort this out. I do not know what else to do as I have tried every possible line of communication available for Cell C SP to resolve this.