Denying cancellation and bad service

I took out a LTE contract with Router, and within the first week noticed that there is no signal in our area. Logged the complaint and was told to roam to Vodacom. This also didnt work. Called the store to cancel the contract as i was in my 14 day cancellation allowance. Store called Cell C and was told that Cell C will investigate network coverage and contact me back. The store has since followed up twice and only received bad service. I have recordings available. Cell C tells the store that they will contact me to investigate. Nothing has happened so far. When the store called Cell C the last time they were told that the query is resolved. I STILL HAVE NOT BEEN CONTACTED!! also, now i receive a bill for R1300 but to date have not been able to use the service? Cell C agrees on recording that i am on the edge of the network range, but still refuses to cancel my contract or to contact me? I did not get this contract to get 2G coverage at best, I agreed to an LTE product which i have not received once. How is this possible? How am i denied my right according to the CPA to cancel a contract for something that doesnt work? REF: ********** 136 708 SD: 659669