Lack of respect and integrity

I have sold my existing vehicle to my sister in law and have bought a new vehicle at a discounted price. All that needs to happen is for them to pay me the money so that I may pay the deposit. They are putting almost half the purchase price in cash and have app**** for a portion of the finance through FNB Vehicle Finance (Wesbank). 5 days ago the application was 100% complete and approval received online. You'd think that they just need to verify FICA docs and pay out the loan. After 5 days and sending e-mail inquiries, no response was received at all and calling the complaints line just led to being sent from pillar to post and being transferred to peoples voice mails. After numerous attempts and finally speaking to someone that seemed to be the only competent person at Wesbank, it was said regardless of the disgusting lack of service, disrespect and lack of integrity in this application, they will first want to get a pedigree on the car, research it's history, inspect the car, interview me as the seller, vehicle has to be RWC again and a list of things that make no sense, before they even continue with the application??? I now stand to lose R45 000 discount as I cannot pay deposi