Settlement letter nightmare

I have been waiting for a settlement letter since Friday 01/04/2022. I have sent emails, made phone calls to no avail. Standard bank failed to debit my vehicle payment. Now they are making it my problem in that I can’t get a settlement letter while my account is in arrears. I even asked them to do a double debit on my pay day. But because Standard Bank do as they please, they tried to debit account today. I have lost a car deal because of Standard Bank. I am on the verge of losing another one. All I am asking is for Standard Bank to issue the settlement letter, I promise never to finance a car with them.