Cannot Connect to the Internet

I have a Data 3G Contract and for the past month i cannot connect to the internet at all, and i am paying for a service that i cannot use, and i have logged 3 calls with cell c, and they advised that everything is fine on their side, but does not help me, and i am getting very frustrated as i cannot use it at all, and i use it for work, either they get it fixed or cancel the contract for me?<br> <br> Cell C: Number: ***