Vodacom poorest service

I am living abroad and for some reason Vodacom does not acknowledge my cancellation emails. My contract has expired 3 months ago and they still charge line rental. I have tried their cancellations department email address, the upgrade department and on their live chat line. No help whatsoever. This is bull****. I will then just let the debit order bounce from here on. Vodacom was good until it started falling apart like Eskom and SAA.