CellC fails to deliver

I've been battling since Oct'14 with signal issues on CellC In eThekwini (no probs for 2 yrs) I've done a sim swop, sent it in for warranty repairs (entire board was replaced). Still no signal. Spoke to ***who came to inspect signal at my home (complained about home and work - I rely a lot on data access for whatsapp and FB) A week later they called me and told me it is because I am below road level (I'm on a slant down a hill with another 5 levels of houses below me - what about them?) I found a number for a local Cell C office and they said they will investigate (031570 number) I checked yesterday and was told (as per the supervisor) that it is basically not their problem and there is nothing they can do about it. YES THERE IS! Put up more base stations to cope with the load!!! Was told to register on Vodacom which is \not permitted with my sim card"I am a paying customer and now put my fat foot down!!!!! There are 1000's of people in the Highway"