Unhappy customer service from MTN

I entered into a contract with month in August, where I purchased a mini router, where I am to receive 130G of data monthly.

1. my personal details on my statement is incorrect. I have send an email on numbers occasions (every month since August) requesting for my personal details and this has not yet been done.

2. `I am being charged for data that I am unable to consume because every time,I try to connect to the router, it specifies that I am connected with no internet.

3. I have tried calling the call centre but I am unable to get through

4. I visited the MTN Key West on Saturday the 19th of November to have the issues resolved in person. I arrived at 14:30 and the stop was closed, even though the trading hours are from 08:00 to 17:00

5. I have escalated the issue on twitter, speaking to different people on twitter and my issue still hasn't been resolved.

I wish to cancel my contract because I refuse to pay for data that I cannot consume, where no one is trying to resolve my issue