Bad service

About two weeks ago I approach DTM Nissan in George for finance on a vehicle. After the application was submitted and within two days I was informed that I was provisionally approved and needed to supply payslips and the deposit. 4 days later this was done and the deposit payed electronically over. Three days later I was informed that the deal is now declined and that they need more info. At this stage I have lost trust in DTM George and requested that my deposit be return. A week ago, the money was transferred back to me via a cheque without letting me know that it will take 7 days to clear. When I discover this I quired it with the FA that was handling the case who only responded two days later after I threaten her to speak to the DP. To date the DP didn’t return my calls. I have since lost a good deal with my deposit been held. The FA responds to all this is that their policy state that all refunds to customers must be by cheque. A big dealer like this still working with cheques and to gain the benefits to the disadvantage of the customer