LG Electronics — not received bill for service

I have an Lg refrigerator which is approximately 2 years old purc chased from Jamnagars-Mahavir Electronics .since dec 2008 it started makind very much noice. we had logged complaint on 15.04.2008 .the complaint id was W8C41505267 which was going to be handled within 2 days of complaint but after so many follow ups and reminders your engineer came to us on 28.04.2008 and rectifed the problem.we were informed by Jamnagar dealer that the service charge would be Rs 250/- but the engineer charged Rs 335/-. He didn't replace any part of the refrigerator. me or my husband was not there at the time of his visit. my mother was there at home and she gava 335/- as your engineer told that min service charge is Rs 335/-. In addition to that he has not provided any bill or receipt of the same . We had complaint about the same when we received the call from your customer care and they promised to send the bill within some time but till date we have not received any bill. plz fix your chages structure and advice your engineer to arrange to provide us bill for his service.