Indian Oil Corporation [IOC] — Cheating and no complaint register given by Dealer

Address:

Kukatpally, Hyderabad, Hyderabad, Telangana

Dear sir,
Today around 4.30pm, i went to fill the petrol at IOC filling station (Dealer code191601) at near balanagar metro station, Hyderabad. here, the pump owner maintaining separate pumps for normal and extra premium. in another pump, they are maintaining extra premium petrol and normal petrol also. but they are not filling normal petrol there, they sticked very small sticker on the pump, which is not visible and customers will not notice the price. if you check, you can easily notice that they are cheating.
For this issue, i want to complaint and enquired and demanded complaint register, Even after arguing, the filling station people not provided the complaint register.
This is very bad and worst that they are intentionally making cheating.

I demand a serious enquiry and need to correct the dealer and waiting for reply.