[Resolved]  Videocon Split AC — Used Piece Delivered

Sir,
I bought a Videocon split AC under staff quota on 26th Sept, 2009. When I opened the box, I found the delivered piece to be a used one. On contacting the company (by phone), I was told that it has happened by mistake and it will soon be replaced by a fresh piece. When nothing happened for 3 days, I approached the company and they asked for a simple application as formality and assured me that i will get a fresh piece by evening. I did not get a new piece. Everyday for a week, I called up the company and everyday i was assured that I will get a fresh piece by evening. It has been more than 15 days and I have not got the fresh piece. Now the company refuses to accept that the mistake was on their side. What should I do? Please guide me