No signal with Cell C!!!

Took a contract with Cell C in March 2014. From the time I have the contract I have not been able to pick up Cell C signal or 3G signal for that matter... to get signal I have to Roam on another network (Vodacom) to get signal... Which is absurd... I made an issue with Cell C and they said they will get back to me and they will get somebody to come home and test the area for signal...Many times during the duration of the contract people have told me my phone is always off, meanwhile it was on but because Cell C signal is so pathetic they cant get a hold of me. I am now tired and fed up. I cant even Use my internet because it is so slow. CELL C needs to sort this out. They need to sort out the signal immediately or I am going to take this further. I am certain I am not the only person with the problem. Absolutely not impressed with Cell C service and the network and would not recommend it to anyone else