negligence when linking the accounts

I went to the FNB Branch in Three Rivers (River Walk) to link the Standard bank Vehicle Finance Account to my FNB Cheque Account number. I was informed by the Consultant who was assisting me that the system is not accepting the accounting that I gave to her, after several attempts by the Consultant still she informed me that the system still is not recognizing the account number. She then advised me to go back to Standard Bank to request the bucket account number for vehicle finance. I was issued with a bucket account number by Standard Bank and was told to use my Vehicle Finance account number as reference number. <br> I went back to FNB to the same Consultant and handed the written note to her to link the account with my cheque account. She handed me a print out for me to verify my details, on the print out I verified my details and my Account Reference number was showing the last four digits. I then asked her why is she using the last four digits instead of the whole account number as reference, she told me that Standard Bank will know whose account it is. After assuring me that everything is fine, I then signed. 8months later standard bank wanted to repossess my car.