Vodacom retentions and cancellations department

I have phoned the Vodacom retentions and cancellations department three times in the past two weeks, requesting to cancel an existing cell phone contract. Despite these three phone calls and three emails sent I am still waiting for response from this department. The phone calls were fruitless and consisted of talking to a rude man who insisted that I FAX a letter through to them as the emails and verbal instructions to cancel the contract were apparently not enough. This is completely unacceptable service. If the contract is not cancelled by the end of this month I will cancel every and any business I have with them.