Poor service that results in me not being able to get further loans

I had vehicle finance in 2007 with Wesbank and was hijacked on the 10th December 2007. My insurer had settled the claim in early 2008, but had short paid as they paid 2 days later than the expiry date on the settlement letter. I then tried to finance another vehicle but I couldn’t as this shortpayment was a poor record on the bureau listings. I paid the amount owing and sent this to the FNI who then got me financing with BMW finance. I had financed 3 other vehicles since this date of which one was and still is with Wesbank (2016 - Date). I had only discovered now that there’s a bad debt written off with Wesbank and now unable to obtain a home loan with FNB. I tried rectifying this and contacted Wesbank. I have been bounced from pillar to post and believe that only one person can assist me as that person is working on my file. I battled to get hold of Itumeleng for 3 days on ***. On 17 December 2021 at 11h21 I managed to finally get hold of Itumeleng on *** who wasn’t very helpful at all. She said there is nothing that can be done, no payment that can be made and even said that I must apply with another bank and not FNB. She said she will send me the statement and dropped the call without allowing me to ask her which email address she will send it to me on. Its 3 days later and I still don’t have the statement. This is shocking service from Wesbank/FNB. I now cannot get finance with the bank who hold 7 active accounts of mine.