Maruti Suzuki India — Credit card 2% extra charge

Address:

Pune, Maharashtra, 412219

Is it mandatory to pay 2% extra charge for credit card payment????

I had took new swift dzire car at that time maruti executive asked me to pay 2% extra charge on credit card payment...
At last i had done RTGS and took a delivery .

Hence i just want to know is it compulsory to give 2% extra charge for credit card payment?

On 19th March i had give a complaint but yet my issue is not resolved daily i am putting mail's them eventhough they cant reply...

So pls help me in regards...