Vodacom using underhanded tactics to retain customers.

I have a contract with vodacom which expires at teh end of March. I emailed them on *** and *** however I have not recieved any confirmation from them. I tried calling *** but the holding time is long and the 2 times i managed to get through, my call was dropped both times. The only time i got a response was when i sent a DM on twitter and a consultant called me and requested i double check their offers before i cancel the contract. I was at work and unable to talk long and we rescheduled the call but i havent heard anything from them since. They have a voicemail for upgrading your contract but no message or information readily available for cancelling the contract. It feels as though Vodacom is using underhanded tactics to retain customers. I want this contract cancelled!!!!