Cancellation of Contract

The cancelation department/service from Vodacom is the most pathetic and frustrating I have every come by!! I have been trying to cancel my Vodacom contract since December and to date this issue has not been resolved? I phone every single week to follow-up, have the issue be escalated and then nothing further happens? When you follow-up on the follow-up, then there is no evidence of my previous discussions. Seems like most people have this issue where you can't cancel your contract.