No Single on 3G

I need to find out how to i cancel my contract as i cannot use my 3G due to there never been a connection, only limited service, this is in Sunninghill and Noordwyk in Midrand, the last time i logged a call they said that it is a coverage issue, so i want to cancel as i cannot work due to me not being able to connect to t internet, and this is for work.<br> <br> I have logged maybe 3 to 4 calls and all i get back from Cell C is that there is a network issue, then they say that it is overpopulated, but i do not care, i just want a connection, and if not cancel my contract, which is what i want now, as i have it for over a year and i cannot use it but i am paying for it.