Corporate Incentive Solutions — defective product sent after long follow up

Address:

411028

In our society tata sky broadband launched and in offer they gave gifts for particular package. I took the same and i registered for free gift which supposed to be delivered in 15 days from the date of registration as per their policy. I registered on 16th march 2019 every time i called them i hear one thing that it's delayed due to quality check but finally i took stand and after continues follow up finally gift was delivered on 29th april 2019.
But the gift was defective and not working as mentioned so i raised this with tata sky delight team but they are refused to send me replacement and they are so arrogant that not accepting their mistake.
Similar lots of people in my society facing similar challenge