Consumer Redressal

I purchased a beetel dongle from this store and after going home I realized that it is not compatible with my laptop. Micromax dongle works on my laptop. I went back to the store for a exchange to a differnt dongle as beetle doesn\'t work but the store is not ready to exchange the product. To them as the product is not damaged and it works on their computer they will not exchange it. they fail to understand that this product of Rs1550 is useless on my laptop. howcome there is no exchange policy? I am not asking for refund but just a exchange to a micromax dongle or some other dongle which is compatible on my laptop.