loss of my personal funds due to negligence

I am extremely upset with wesbank and the service I have received. I have app**** for vehicle finance which was approved I want through all the processes and tests required and the vehicle passed without any hassles once all the documents were aimed and sent back to Cassius who is the guy dealing with this application I was told due the the model I cannot get the amount i have requested for initially it has dropped by R10000 This to me is utter **** because this should have been told to me initially before having paid for the road worthy test, AA test ,licencing the vehicle and not forgetting my time and petrol running around for 3 says and making phone calls also paid a deposit of R2000 for the vehicle I would of thought that being such a huge financial institution wesbank would have better protocols and systems this is misleading customers its so wrong because my money is involved I have spent almost R4000 for nothing to me that's a lot of money had the situation been different whereby the deal.was totally declined I would of understood however my personal funds have been wasted because the car passed all required tests and only now I get told the amount is changed