No signal even in cities

I'm so tired of Cell C having no signal! I had no 3G whilst sitting in my office in central Durban yesterday! Then today, same place, I have no signal and swop onto vodacom! Whilst away this last weekend, I also had no signal and kept swapping over to vodacom. I was five minutes from Port Shepstone and others had signal on different networks! This is annoying me now as MTN and vodacom can provide their customer with signal but Cell C can't. Stop wasting money on these huge, elaborate tv adverts and invest in some signal infrastructure! I'm getting a new contract and swapping to some else! Tired of paying for airtime and data and not being able to use it!