MTN Failure

I was sold a data contract by MTN. The device was delivered, sim activated and RICA was successful. I have been unable to connect the device to the internet as it appears that data has not been allocated to the sim?? I have called the MTN call centre at least 9 times over a 2 week period to help me resolve the issue with no luck. My account bank has been debited but still no data after logging a number of calls. The contract stipulates a cancellation clause, but there is no detail of who to contact and how to go about this. One would imagine that if you are in the Telecom's business you would handle these simple queries with ease. Not happy as a first-time MTN client