Vodacom is a disgrace

I have now had enough of Vodacom, again they have chosen to ignore my previous complaint even after emailing me telling me that one of there consultants will be in touch with me shortly. How hard is it just to simply close my account with Vodacom, I have paid my account in full and my contract with Vodacom. All I want if to close my account but yet vodacom chooses not to get in touch with me and would much rather steel money from me on a monthly basis. I will not tolerate this service from vodacom, and will now be seeking legal advice, this can be avoided if Vodacom just help me close my account.