Rns Motors — Issue in refund

Address: Jorapur pet Banagar Galli

I am Vinayak Heralgi I took Swift VXI model car delivery on 17th Aug from RNS Vijayapur, Karnataka. Unknowingly I paid extra amount to showroom at last calculation I came to know that I paid Extra amount. I requested to Finance department to refund my extra paid cash now they are telling me after your vehicle passing we refund I asked cashier to write the same and give he is telling you go and meet AJM. I did not get how it is related to RTO passing why I should talk to AJM as it is internal revelry and miss calculation from sells department. How RNS can make customers to suffer like this I have to go showroom by taking leave from my office.
Kindly do the needful.