NEVER ENDING CONTRACTS!!!

I took a contract more than 4 years ago and when it's time to end it I always get calls to upgrade while I have signed a contract cancellation form several times. Upon calling I am given case numbers after case numbers. But amazingly enough I still get charged. <br> <br> Recently my number was cancelled and I was told that I can't claim for the months that I have been unrightfully charged for until it is reactivated. With another contract that I took two years ago, I signed a cancellation form for in June and the same that happened to my previous contract is happening to this one.<br> <br> But I still get charged and I'm wondering if I will ever be refunded for all these months.<br> <br> Telkom has the best coverage and products, I am happy with them, but when it comes to customer service, I don't know what's wrong.<br> <br> I hope I can finally find help.<br> <br> Regards