HP India — HP ink advantage

Address:	New Delhi, Delhi, 110075
Website:	HP

I had ordered hp ink advantage 3 in 1 printer in april this year. it had an offer which included free ink cartridges. i had uploaded all the necessary documents online and applied for the same.
I received an email stating that it has some discrepancies and could not process the free ink cartridge as the date of purchasing is after the free cartridge was applies.
I was asked for my invoice. as per my invoice my details were correct. but they had some issues. i contacted aditi computers pvt. ltd. dc janak puri from where it was purchased. i also talked to the concerned person from hp who was present there.
He apologized and promised to get it delivered.
Its been several weeks now but no action has been taken from them.
Are they looting or scamming customers by selling the free offers separately.
Or has a good and renowned brand name lost its authenticity and business ethics.
Kindly suggest what appropriate actions can be taken.