poor network

I had a samsung s3 on a cellc contract. the network service was okay. then two weeks before i did my upgrade i started to experience problems. 1. i get cut off in the middle of a call. 2. the call breaks up. 3. i play online games and just get disconnected. 4. sometimes cant connect at all. I upgraded thinking a new phone will solve my problem. How ever 3 hours after getting the phone i could not download whatsapp or make calls. my new phone was sent away i had to wait 2 weeks. i then got a new phone and after changing the settings on my phone as recommended by call centre the problem seemed to be resolved however. i still get disconnected. on my tablet i also get disconnected also on cell c. i play my online games on my vodacom tablet. i report this to cellc call centre by calling from my vodacom phone as cellc network is to independable. A lot of people in the secunda area are experiencing problems. this my cry for help. please wake up cellc and give us what we pay for. each time i talk with someone diffrent on call centre and each time i get the same lame advice. put your sim in diffrent phone and see if it helps. my sim must work on the phone i have on contract.