Bad Service

I app**** for a contract with MTN on 21 January 2016, the sim card/handset did not work and after several days of begging the personnel to fix the problem to no avail, I took the handset back and insisted on cancelling the contract within my 7 day cancellation period. They said they will do this. A few days later I phoned MTN Customer Care and found out that the contract has not been cancelled. I contacted Michelle who said that there is no such thing as a 7 day cancellation period and that the phone is fixed I must pick it up. After threatening the store with legal action, Michelle suddenly said that they are able to cancel the contract in 7 days. She promised to keep my updated every day until it is done. After receiving no feedback, I contacted her to hear if it was done. The cancellation was still not done and she promised to keep in contact. It is still not done. It is almost a month later, I have no activated MTN Sim card, I am losing business because of this and I am seriously considering legal action against the store. They are going against MTN Policies and blatantly ignored and **** about the 7 day cancellation period. I am getting no feedback from Michelle.