Blackberry
Non receipt of cash receipt and service

I purchased one blackberry from airtel sales manager Mr. Manoj on 8th of august his mobile number

919936705134 this man has taken money delivered the phone and disappeared. Every time i call him either he is in meeting or training so far i had called him 30 times now he does not even pick the phone. I have the phone with old backcover minus cash receipt.

Please advice what course of action I should take.

Thanking you