Disgusting service

I am absolutely disgusted in the service from Cellc and management (Njabulo) it's been months that I am struggling to get cellc to allocate my payments correctly! I've provided them with all proof of payments and no one contacts me back regarding an update. The last feedback from Njabulo was that the finance team allocated payments to a new contract which I've been paying via debit order so how the hell can 2 payments be allocated to 1 thing. I've spent hours on the phone and your customer service team is no help at all. Currently is still shows I am owing an amount of R1100 which I have sent the proof of payments for over and over! Please get somone senior to contact me ASAP. I have logged an official complaint as well and definitely take this further if there is no resolution soon!