HP India — wrong product given by dealer

Address:

842002

I bought hp laptop from muzaffapur city bihar by one of the hp resseler at the time when i was on the shop he has told me that he installing oriniginal viersion but after buying when i checked it was not the original. And he denied to install again. Now my laptop is totally screwed. Shopkeeper told me hp never provide original version. And he is asking for mor money that was up to 12k n laptop cost he took 24k.
I would be thankful if you resolve this as soon as you can.