Inconveniencing network service

Its been 4months now trying to get my network issue resolved with no luck. I have two contracts with cell c and both numbers im struggling to get network. Its very frustrating having so much data on my fone but not able to use it. I cannot access the Internet. I thought the problem was with my phone, even brought a new sim card from mtn and its working just fine. I called their contact center several times at first they would guide me on what to do on my phone, one day they send a guy namwd mandla. Mandla was helpful but two days later network went back to the way it was.Im sick of calling contact center to complain bout this issue cause i feel its eexhausting considering the number of times i called. If it were possible i would cancel both my contracts and then move my number to another network. Im not happy with cellc and would never recommend it to another person.