Indian Oil Corporation [IOC] — filling fuel - diesel,

Sir,
I went to IOC fuel pump at ### Kerala at 4.45 pm today and asked the worker to fill deasel for 1000 rs. Then there was a car filling fuel in front of me . When my turn came the worker opened my tank and put the filling pipe to my tank .After a while he has printed a bill for rs 791.94 and taken out the pipe and again put the same to the tank. He started the operation again and filled fuel into my vehicle. After that he gave me two receipts, ie, for rs 791.04 and rs. 208. I felt that that the fuel as per the first bill is not filled into my car. Iasked the man why it is two bills and also .06 paise less. He has no satisfactory answer and only said that he has filled the fuel.
Please verify the matter and convince me what happend.
why he has given me fuel as per two bills.
why it is 6 paise lesser.
whether i was cheated.