Galaxy Toyota — Refused to take payment thru Credit Card and ask for 2% extra

Address:

Shalimar Place, Near Rohini Jail

I had booked a SUV with Galaxy Toyota Shalimar Place Near Rohini Jail on 14th Dec 2022 with payment of Rs 25000/-
I again visited on 22nd April 2023 (Saturday) for Part Payment. But Cashier has refused to take payment by Credit Card and ask for extra charges i.e 2%. I came back home and enquired from my Bank (CITI Bank) . Is there legally allowed to take 2% extra. MY bank told me it is totally illegal.
Kindly look into my matter and take appropriate action against the dealer.