MTN nightmare

I upgraded from a data stick to a phone over the telephone on Monday 12 November. I was informed that I will receive my new phone within 14 days. After two weeks I phoned the call center but they said because I upgraded through a agent they cannot help me I must contact the agent. The call center gave me the number of the agent. I called the agent and told them the story and they said there is nothing they can do as it is at the Currier service. After three weeks I sent MTN a mail which they promptly rep**** to wanting certain detail from me. I sent them the detail, they let me know they ars sending the query to Channel Support team who let me know they will come back to me within 24 hours ,that was on 9 December. I still have heard nothing from them. I let MTN know i am cancelling the contract and still no response. Regards Kenny