[Resolved]  SBI Credit Card. — Extra charge on final billed amount.

Address:

Mumbai City, Maharashtra

I have made a purchase of some electronic items on my SBI Credit Card.
The final billed amount was Rs. 29,850. The merchant was supposed to swipe my card for exactly the same amount, but he charged me Rs. 30,447. That means the merchant charged me 2% extra amount just because I preferred to use electronic money.
Now my question is are these merchants authorised or legalised to charge this extra amount from customer.
I contacted SBI in this regard, SBI says that they dont take any extra amount from merchant and it is his call to charge this amount.
I was really shocked to know this... Why the hell to pay extra money?

Please guide me further.
My email id - [protected]@gmail.com