Cell C Legal Department Incompetence

Had some issues back in 2016 but I paid up and cleared my name. In January 2018 I app**** for a Data Contract which was granted no problem, since then the debit order is honored. Yesterday I app**** for a Cell Phone contract, different story: Cell C credit vetting per-approved my application but then Cell C legal declined as apparently I have been handed over for something they cannot tell me. I called the Collecting agency handling Cell C debt collecting requesting information, supp**** my ID and nothing came up, the lady stated that no their is no request from Cell C for collections. Puzzled I assumed that it must be something else and retrieved my credit report from agencies both came up way in the green with nothing against my name. I went back to Cell C Brits, the lady must be said was very helpful, She called their legal department who stated that I now suddenly owe over 2000Zar from 2016. This is absolutely bull****, how is it then possible tpo vetted by their accounts department and their legal department sings another story and How is it possible to then have acquired a contract in January. I paid up in 2016 and now all of a sudden I owe 2000+, why haven't they then pursued this matter in 2 years and why is my credit record clean. Sort out your incompetence, this is nonsense!!!