Vodacom does not respond

Intenet access to my other computer was cut off. I went to Vodacom at Cradlestone Mall and was told to buy a new SIM card as mine was \dead". I still could not get access. After 2 days of fighting the call centre I was told that I had been cut off as I had used up my date bundle and I owed Vodacom 4x the amount of my monthly contract. I disputed this but no help was given. I was given no warning that I would be cut off. I then emailed the cancellations department on 23 March saying I wanted to cancel my contract .I received an automated response telling me that they would reply in 24 hours. A week later (and 2 more unanswered emails later) I have still not heard from Vodacom and have no access to internet on my other computer despite having paid in money. I want to cancel but they ignore me"""