Bajaj Auto — two wheeler loan extra processing fees

Address:

Mumbai City, Maharashtra

I took a bajaj bike from their navi mumbai showroom. Bike's onroad cost after tax and insurance is rs101000. They suggested the bajaj auto finance. But after taking the bike one lady from bajaj finance called me and told that my loan amount is 94000. Actually, i have already paid a 15000 in advance. So an extra rs8000 is charged from me. When i asked the dealer, he is tellig that, it is the bajaj finance took that amount for the processing and other charges. When i called bajajauto finace call center, the guy even don't want to tell me processing fees percentage.
I was not informed this abnormal charges when i opted this co.

Now, what should i do?