Poor service

I immigrated last year in October and cancelled my Vodacom account before I left. Vodacom renewed my contract in February without my consent as I'm not in South Africa anymore. I have contacted Vodacom via telecom and emails on their customer care line and email's to their collection department with no response whatsoever. I haven't used my South African number since then but getting billed every month and nobody can solve this problem. I can be contacted via email as we have a huge time difference.