CHARGED MORE RUPEES THAN SERVICE PROVIDED BY COMPANY

Location/place: BIKANER

Name of company/service: INDIAN OIL CORPORATION

I purchased petrol of 100rs from IOC
petrol pump BIKANER.but salesman gave me only of 99.96rs. When i asked him about remaining 4 paises he denied. i want those 4 paises. salesman also used vulgar lanugage for me. plz help me.