Finance not approved

I am quite upset with the way Wesbank handled my finance application for a new car. I app**** for finance and was approved but had to supply my bank statements to prove that the maintenance I received appeared on my bank statements. When I supp**** this my finance was declined due to the fact that my maintenance was not through a court order. On Transunion I am classified with a credit score of 860. How the hell can I have an account with Wesbank for 4 years and have a good payment record and the new finance was basically for the same amount my current vehicle is but then get declined because I do not have a court order for my additional income. Then my current interest rate on fixed is 12.75 but they would have only approved it at a linked rate of 16.95. This is so rediculous. I am so upset with this whole situation. The banks know that us as consumers are dependent on them to get finance and does not look at ways to help you. They only look at reasons to decline your application.