LTE-A HOME WIFI ROUTERS NOT WORKING & *****ING MY DATA

In October 2018 I took out 2 data contracts with Cell C at the Parow Centre Mall. I checked the LTE-A coverage with them and decided on a 200GB and 50GB contract. Both home routers started giving problems not long after we started using it. Cell C booked them in and gave me a new one saying that it's the settings and software. 3 months later exactly the same thing happened. The data card does not work in our phones. Now the routers are out of warranty and they are asking R575.00 to "fix" them. I then wanted to cancel my contract because Cell C cannot provide the service they are advertising, thus FALSE ADVERTISING. In the meantime I am paying almost R1400.00 per month for data I cannot use. This has been going on for months and I have visited various stores over the past weeks in the hope that someone will assist. The in store consultants are very arrogant saying that if I wish to cancel the contract of which 9 months are remaining, I have to pay a cancellation fee and provide proof of payment before they will do anything. I will stop my debit orders. You are *****ing and definitely the worst service provider I have EVER dealt with!!!