POOR SERVICE LEAVING CELL C

Renewed my contract in October/Nov. Decided that i dont want the upgrade any longer. This call took place on the 7th Nov. kept calling in regarding the cancellation na dkeep receiving the same feedback that it is with retention eventually the new Item was collected and then advised that cause they took 2 weeks to call me back I was responsible for December payment i accepted this even though this was complete Bull**** as requested cancellation on 7th further to this i am still being billed for this and the debit order for this January month is still going off even though my initial cancellation request was on the 7th Nov. and legally required 30day notice. Request for manager now this entire week and still no return call from Cell C management to resolve the matter.