Today was the second instance at this petrol pump where the filler stopped at 50 in spite of me telling Full tank. This is their regular trick. They will stop at 50 or 100, behave as if they heard 50 and then show you 0 on the reading and start filling again. Then they will ask you to pay for the shown reading plus 50 or 100. Where in fact only the current reading is the actual amount. I suspect they are hand in glove with the bunk owners who might be incentivizing these malpractices!