Very disappointed

Hi team HP Upon some bad service and experiences with Cell C last year, I decided to cancel my contract with them. I called their call centre and got a settlement figure. I paid it in full on the 27/07/2018 and forwarded the proof of payment onto them. I received a cancellation and termination of the contract sms. A month after that,I received a call from some lawyer claiming that Cell C had handed me over due to some bad debt. I explained my situation to the lady and forwarded her the proof of payment as well. She said she'll look into the matter and contact me back, she never did so I take it, it was resolved. In December 2018 another law company called me, same story, I forwarded the proof of payment. Had contact for a while with that lady but it died down eventually. So, 2 weeks ago, 22/04/2019 my fiance and I put in a Home Loan application at a bank and there we discovered I was placed on the bureau on the 01/08/2018, just 3 days after I've settled my debt with them. Since that date I've been on the phone with almost every department everyday at Cell C trying to get some played up letter to continue my Home Loan application. I've been told that their legal department should assist me but they've been on strike for months now and we can't even get a turn around time. I've since also tried to get help via their Facebook page, they promised to make contact with me, no luck. I'm at my wits end and I really need this letter. Please help me team HP Regards Ismail