Indian Oil Corporation [IOC] — Petrol quantity related

I purchased petrol for scooty of amount rs. 100. But i received only half the petrol as per meter reading of scooty. Before me one person purchased petrol of rs. 50, after which petrol was given to me. Please corelate invoice no 239489 and 239490 dated[protected] at nozzle no. 2. the meter was not reset to zero before giving me the petrol. I braught this to the notice of saleslady, but she refused to accept it and gave me the receipt.