Cell C - unacceptable customer service

After I wrote to hellopeter regarding my bad experience with Cell C, they called me twice but are still not willing to help me. They insist on documentation that proves the cancellation of the contract. The franchise at Mountain Mill Mall where I cancelled the contract, never gave me any documentation and had closed down a few years ago. I provided documentation that shows that the amount of R2847.20 was paid on 26/09/2014 for the cancellation of the contract. I only recently found out that my contract was cancelled March 2019. I did not give any instructions to cancel the contract. I insist on a refund. It is time for Cell C to see the matter from the customers point of view.