Delhi Police — irrelevant penalty

Address: JAIL ROAD, New Delhi, Delhi, 110064

This sunday, on 16 feb 2020. i was travelling to my work place. while driving car i got a call in between, i checked my phone, its from somewhere urgent. so, i stoped my car aside of the road and immediate next to me there was traffic police standing. they dont know the whole scanerio but still they come to me and asked me why you sudden stop the car and checked the phone, they told me that i violated the law, but i wasn't, therefore i parked my car before picking up the call, which is totally fair. still they fine me and charged me with "using handfree" and penalty of 5000/- which is unfair.
Its my humble request to revert me on this issue.