Poor service

I called Vodacom to cancel a subscription which was expiring a few weeks ago and they convinced me take a cheaper package that suited my needs. The consultant promised to send me the details of the contract which needless to say I didn't receive. Today I called to query why my data wasn't coming through and was asked a bunch of security questions one of which was the name of the contract and another my address which I had told the consultant who changed my contract to update. I apparently don't know where I live nor did I know the name of the contract which Vodacom failed to send to me so I was told they couldn't help me. I asked to speak to a team leader who is yet to call me back. For the 2nd time now. I would like to receive my data that I am paying for without having to go through to Call Centre agents who don't do their jobs and team leaders who disgrace the word leader.