Paying for a service that i cant you....

I entered into a contract with Vodacom on the 26th of August 2015 online, the phone had a fault and I took it to VODACOM southgate. I filled the OBF form and the technical consultant called to say the phone is ready for collection. I went to collect the phone and one of the other consultants sold the phone that meant to be mine. The technical consultant said the phone will be available on the 16th of September and he will call to come collect it, when I went the branch, the phone was not there. He said the same thing for the 2nd of October and still I don't have a phone. When I the contract department to cancel the contract, they want me to pay 6 000 but I'm not even using the phone thus I do have a basis to cancel the contract. They don't care I guess. This is the second compliant I have put through Hello Peter, the first time I sent the compliant, Vodacom rep**** to say they will contact me and they did however the consultant said he would call me back, until this day I'm still waiting for the call back. Last week I called the head office to send a compliant and they said they cant help me I should contact southgate branch, just imagine. I will see what happens now after my tweet