[Resolved]  Samsung India — no invoice for a phone purchased

I have purchased the phone from the internal portal and it has been one month now and they have not generated a bill for the phone sent.
Not sure of they are making a fool or saving tax by not providing the bill to the phone which is sent.
I have called the customer care several time and the only assurance they can give is to give me a reply that the invoice will be sent in next 24 hrs.
I really want to return the phone but the same is not possible as per them.