CellC refuses to cancel my contract

On about 21 April 2015 I called to cancel my contract to go to a competitor. I was advised that a port request was already logged and that my contract would port automatically when the contract expires on 22 May 2015. I specifically asked what was to happen in order to cancel, and the answer was to do nothing. No port happened. On 25 May 2015 I again called and explained the situation. Agent undertook to revert. but did not. Later I called again and spoke to Nomvula, expalined the issue again. She undertook to revert in an hour. Three hours later I again called and spoke to Xolile as Nomvula was busy. I explained the issue to the third person. She told me that I had to pay for another month before I could get out. Everyone blames \the system". I requested to speak to her manager"