Total frustration

My Telkom mobile contract has expired, I have tried to get it cancelled so that I can port my number to another service provider. Trying to do this has been such a night mare, after calling the call centre last month I was told I need to go to the Telkom store to cancel it. I then approached the Brooklyn Telkom store to do this. I completed a form and I was told I need to wait for a notice period of 21 days, this contract will be cancelled. After 21 days has passed I then tried to port my number, and I found that this was still not done from Telkom my contract is still active. I tried calling the Telkom call centre and it was confirmed that it was not done; I needed to get a case number I didn't have. From the system, there was no notice period or cancellation done. This is not the first time such drama happens, I tried to cancel a 3g contract from Telkom mobile, and according to my account records from the call centre, there is a notice that is acknowledged for this cancellation that was done during June 2015. But to this day, this contract is still active I am still billed every month for this. This is very frustrating, and such huge inconvenience ???