Paying since 24/10/2014 for a tablet not received

Vodacom launched a tablet with 500MB. They phoned me and offered me a deal. Credit vetting passed and I waited for the tablet to be delivered. I advised Vodacom that I have relocated to Durbanville but they assured me that they will courier the tablet. During numerous phone calls to collect the tablet I informed them that I stay in Durbanville. They assured me it will be couriered to me. I received encrypted E-mail billing that I could not read. after a few months a complaints In January I received my billing in PDF format and then saw that Vodacom billed be since 24/10/2014 for the unreceived tablet. I requested the cancellation of the tablet since i have not received it and never signed a contract. I have been to the Customer Complaint Centre in Canal Walk here in Cape Town twice and they spent hours on the system to cancel the contract and request refund without any success. I have been in constant contact with Vodacom 4U Loch Logan without any success.