CellC payment allocation worst experience

Worst 3 almost 4 years of having this contract with CellC. I have had this contract for the past 3 years, I am now being told my payment are missing for an amount of 3000, I’ve sent through proof of payment from last year June so they have a years worth of payments to allocate those that are missing. I have been on the phone with almost 10 different people. Some tell me they will make sure it gets escalated and make sure it get allocated, I have been in store maybe 4/5 times to send through proof of payment. I have not received help at all from Cellc customer care as well as in store, I’m tired of sending multiple proofs of payment and having to explain myself every time I get a new customer care agent. There is no manager or even the number for head office that I could call to get assistance. I’ve been doing this for the past few months and all I want to do is close my account. I have an upgrade coming up and I don’t even want to take it as I’ve had so much difficulty with this account. My mom on the other hand has been with Cellc for almost 15 years and no problem at all, my other contract with MTN is so smooth and I cannot fathom why I’m struggling so much with Cellc. I wouldn’t ever recommend them to anyone.