Videocon D2H — Refrigerator service complaint

I purchased 1 videocon refrigerator from pai international on 25/12/2007. It run nicely till 4years. After that twice we request for servicing. Both time we got good response from your service centre, they changed the compressor and billed around rs.1500 each time. But now i lodge a complaint on 25/07/2013, after 3days some technician came and check. He told to replace some parts and it cost rs.500. After 2 reminder he came and check that compressor should be replaced. And also he is telling it will cost around rs.4500 because it is out of warantee. But when i check your videocon warantee card and book it shows 6years warantee on compressor. And also given that book copy & bill (25/12/2007) copy. According to your company book 6years warantee should applicable in this case. But service centre people telling they will check with company and according to that they will come and change the compressor. After so many reminders and complaints nobody turn. Even nobody bothered about to solve the complaint, because nobody contact me also.