Poor customer service

I lost my job in 2013 how ever I had old mutual finance loan after struggling I managed to pay the account through legal with the discount granted on the 30th September 2019, I was told to wait for 30 days for a paid up letter of which I waited for 60 days neverthless I got the paid up letter and I was listed on credit bureau (a judgement) I phoned transunion and asked them to uplift the judgment they told me to send the paid up letter and a copy of an ID I sent it when I do the follow up I was told by transunion that they can't remove the judgment as the account number that is on the paid up letter is not the same as the one on their system of which I had one loan with Old mutual finance, I phoned the attorney's that gave me the paid up letter and they said I shoul call Old mutual finance as they no longer have my account with them, I then called old mutual finance legal department they said according to them I still owe them so now I am frustrated and I can't get the employed because of that bad credir record with no hope that it will ever be removed, I blame them for not getting a job and being posted from pillar to post after settling the account