Natis Documents sent to wrong recipient, bad service

I have never had bad service experience with Wesbank up until now. All the years whilst my car was financed by them, any issues reported to the them was resolved promptly. Now...I have settled my account, and requesting for my Natis documents - I discover they have been sent to a wrong recipient. My documents we sent last year in June, which I never requested for the documents. It's been over 2 weeks; being sent pillar to post - being told the issue has been escalated and that someone will get back to me. I even requested the tracking details to find out ) where my documents were sent to; the DSV gave all details that they were issued by the bank. Managed to get hold of the recipient, and they admitted to having my documents. However he won't release my documents because Wesbank don't want to send him his documents as well. When he requested for his documents (May 2019) he received mine and has been trying to get the bank to send the correct documents. How does a bank send such important documents to wrong recipients, without authorization and verification? How should we trust them?