Cell C
No help, No mobile signal coverage

I have had bad Cell C coverage for the past few months since I got my new contract at Cell C. I do not know whether this is an Android issue or Cell C, but I can seldom connect to the internet, calls are dropped at random times, and sometimes I do not even have signal. When I insert my Vodacom SIM Card I do not have any of these issues..even when i need to use my GPS for work the signal some times cut out.

Please can some one fix this issue??

I posted the above on the 21st of last month and STILL GOT NO HELP!