Snehanjali Electronics — not giving the free products mentioned in Advertise

Sir,
I booked a split Airconditioner from Snehaanjali Electronics, Kandivali , Mumbai. On 25th jan 2010 with an advance of Rs 2000. Sir they told me to deliver in next 10 to 15 days as they dont have the stock . I agree as i was not in hurry.
Sir after a month when i asked delivery they keep me telling that fresh piece is coming in a day or two. When i forced to deliver my ac they told me to took back my advance amount if i cant wait. This is horrible. Finally they agree to give Ac . I paid the balance amount of rs 10000 on 22 march.
Now sir there was the offer going in the store that buy any split ac and pay extra rs499 and you'll get some free products. But sir when i asked for that offer they rudely declined and told me that when i booked that product there was no such offer. So you could not get this offer . Now sir what can i do?