Cell C
4g service advertised - but not receingany signal

I purchased a Cell-C data sim, for use at my home, after verifying that my area is covered for 3g/4g signal. I get very weak signal or most of the time, no signal at all. which makes my purchase a useless one. I have logged 2 queries on the cell c website, both times i received an email stating that i would be contacted within 48 hours. I still hve not received any feedback or call.