Hindustan Petroleum Corporation [HPCL] — filling of less petrol by kamptee dealer

I went to kamptee new hp petrol pump for filling petrol. The meter reading was rs 100+. I told the boy to fill petrol for rs300 and told him to make the reading zero before filling the petrol. He told that it will come and before making the meter reading zero he started filling the petrol and told him that since the initial reading was rs100+ you have to stop at rs400 but he stopped at rs300.in this transaction he earned rs100 illlegally. There may be people cheated by him. Take action against the kamptee dealer and install camera showing spot meter reading to prove such cases