Refuse to cancel my service

Pathethic service, I was moving houses and had a query, they didn't answer so i took a contract with Vodacom and asked to cancel, they take 5-12 hours to reply at a time, on the 5th try trying to cancel, clearly they are doing this delibrately, if any monies come off my account i will sue you guys as i have an email as well stating i wanted to cancel my account.