Poor Service affecting Credit Profile

I have cancelled 3 x contracts with Cell C in 2020. At the time I had a R390 credit on my account. In Jan 2021, I followed up after picking up unpaid amount on my Credit Profile. I have since been struggling to get a paid up letter for my account. Seeing that my number is no longer with cell c, I cannot use customer service. So I make contact by trying to get a new contract and then get the staff to put me through to Customer Services, I have received two references with promises that "Someone" from the Legal department will contact me to arrange the paid up letter. No calls received up to today 2 months later. Tried to get through to the Legal department but I held the line twice for almost 10 minutes after which I am on a dead line with no response. Can someone from Cell C kindly make contact with me so that I can get this letter please???