Cancellation nightmare

I've being trying to cancel my vodacom contract numerous times via different channels with little success. The email address comes back as undelivered , the call centre *** just cuts the call or is unavailable. When I tried going via the upgrade route someone answers the call but dont talk and alot of background talking. When she finally discovered I'm on the line she answers and cuts the call when I mention cancellation. Pathetic service Vodacom . After being a customer for years I can say this is the worst you've ever been .