Hp — offer on laptop scrapped

Hello all,
i bought a hp laptop from house of laptops, Pune in january and i was told that a home theatre would be provided as a n offer with the laptop. they told me that i'll have to send a demand draft of Rs 1500 to hp as transportation charges so that they could send it me on my address. now after repeatedly calling them and following them on mails and phones, hp is not at all responding to my queries niether the house of laptops is responding to my queries.
My I know what has to be done in such cases? HP is just cheating on its customers.