Complete incompetence regarding cancellations

Telkom mobile are a complete joke. I went into the telkom mobile store @ Greenstone Shopping Center on the 03/09/2015 to cancel my 3G data contract i filled out a form to cancel the contract which was attached along with a copy of my I.D. to Case #***7 it is now the 02/03/2016 and i am still being billed for this contract @ R144.00 per month, the lady in the store says that her paperwork was submitted correctly,she then issued me a follow up case #***7. i then contacted the telkom mobile customer care call center who then told me my contract was still active and there is no case on her system stating a cancellation. i am so p@ssed off now after being to the store and told they dont cancel the contracts and customer care told me they dont cancel contracts... THEN WHO DO I CANCEL MY CONTRACT WITH TELKOM? WHO IS GOING TO REIMBURSE MY R600.00 I HAVE BEEN BILLED FOR AFTER CANCELLING MY CONTRACT? UTTERLY DISGUSTED WITH THE SERVICE