IOCL — Mis selling at company owned Petrol pump

Address:

IOCL company owned Petrol pump.Raninagar, Jalpaiguri 735102

I went to IOCL company owned outlet on 19th Feb, around 9:45 Pm, at Raninagar Jalpaiguri, West Bengal. but Staff there is very rude & forced to have Power plus quality which is 5+ rupees costlier. I have heard this malpractice of that outlet from others too. In night. I challenged them & asked to fill normal petrol priced at 105. Then they given the normal petrol. BUT used bullying attitude & Wrong language. It is damaging IOCLs image due to those staffs wrong practices. Please let me know, how would you stop this wrong practice.