My friend’s recent ‘petrol experience’.

‘Dear friends,
Recently (I think 12/12/2007) I purchased petrol for Rs 250 at A BPCL Petrol outlet (Bharat Petrolium)– at Pallawaram, Chennai, TN. While filling the petrol, the cashier diverted me by asking some unusual questions and filled petrol for only 150 Rs. I asked them I need petrol for 250 why you stop at 150rs; they replied that already we filled for Rs 100.
I argued why without knowing my knowledge you simply filled Rs 100, but they tried to convince me and forced to leave the place as somebody is waiting behind me. I constrained to leave the place with lot of doubt. Also I am unable to make any complaint that stage. Afterwards, I found and confirmed myself I was simply cheated as the vehicle gave a mileage of just 114 for nearly 5 liters instead of 300 litres. My vehicle is giving a average of 60 Kms/litre (Passion Plus). I very much shocked I was cheated. I don't know how to explain this. I want to made a complaint in person, but I don't know where to complaint this. Almost 150rs doesn’t make me bother but am unable accept the cheating at a public service outlet. Hence I request you all, ‘be careful while filling petrol at outlets’’