Worse Network in S. Africa

Hi,<br> <br> I have a huge problem of network reception when at my girlfriend's place (Sommerset Park, Mhlanga Dbn), when people call me I can barely hear them and then the call gets dropped, when they try to call back it takes them to voice mail and when I try to call them I can't make the call but my girlfriend who uses Vodacom has no issues! The strangest thing is when I try to connect it gives the edge or no service error but I get billed for the data I didn't use, I'm sick of this poor service I'm paying for. What can Cell C help me with or should I port to MTN or Vodacom as advised by my peers!!!?