Refusal to cancel contract

Vodacom listed my name on ITC as a person with an arrears account even though i cancelled my contract 3 years ago. I called the call center at least 4 times to ensure that the account is closed, each time I was told that the account will be closed 30 days hence. I had no choice eventually but to cancel the debit order - despite the call center acknowledging that I called to cancel it, it was never done. Shocking incompetence or perhaps deliberate obtuseness? Now my credit record is affected even though I dont owe Vodacom a cent. Be warned - this can happen to anyone that enters into a contract with Vodacom.