WESBANK : POOR SERVICE & INCOMPETANCE

I've been trying to get my NATIS documents from Wesbank since 26/05/2020. I have lost 2 buyers for my vehicle so far due to Wesbanks incompetance. I have send numerous emails,tried phoning several times and been to our FNB branch for assistance without success. I've done everything they've asked for,paid the R350 courier fees,had the bank send the proof of payment to them and send all the info they required to send the ddocuments to me but all I keep getting is automated messages with excuses about covid. I am fed up. My vehicle is paid in full but still they do not send the necessary documents. I need assistance to get my NATIS documents. My last email to them was send the 23rd of March 2021 when I told them I give them 10 working days to deliver the documents then I will get legal action and report them to Hellopeter as well. They still did nothing to even try and contact me. What more do I have to do to get my vehicle documents from Wesbank?