Bharat Petroleum [BPCL] — Cheating at filling station

Address:

Grand road,puri, odisha,752002

I have given rupees 300/- to refil my vehicle
As per the promotion I am entitled to get petrol of rs 315/-
When I complain the supervisor take the promotion code and redeem ed himself without giving me the requisite amount of petrol.
He also didn't give n me bill
Asulted me
Please look into the matter
Location of station. Is grand road. Puri odisha