Paying for a service that is not available to me

I sign a contract on 01/07/2015 only to find out 2 months later that they do not cover my area. I run my business from home and have lost monthly income due to this. I've been to the store they blamed the device, after that I went to Samsung and had to spend many hours waiting for them to reload my device. Samsung suggested I do a sim swap, which I had to do at my expense. Once I used the new sim in a different phone the problem was not resolved. At that point I went back to the Cradlestone branch and they informed me that they are aware of a network problem in the area and can not tell me when it will be sorted. The store manager promised to phone me on Monday, that did not happen, I had to go there again. I'M PAYING FOR A SERVICE THAT I CAN NOT USE AND NOW I NEED A BACKUP SERVICE PROVIDER TO ENSURE THAT I DO NOT LOSE MORE CLIENTS DUE TO THIS. Cell C biggest mistake I ever made!!!!!