Still no resolution

More than a month after complaining - in store, on Hellopeter and via the call center I've not had so much a courtesy call from Vodacom about the debit order that has been going off my account for the last 4 years without my consent. I've never used the SIM card they say I have a contract for. They were unable to produce a contract that I supposedly signed for this SIM. Their own records show I've never so much as sent a text from this contract. But they billed me for it for 4 years. Not even a call? When I phone to follow up and quote my enquiry number (that I got from Vodacom on a printout) they claim it doesn't exist and REFUSE to help me via the phone.