Myntra.com — invalid gift card

Address:

110033

I have been gifted a gift card from my cousin worth 2000/-
Even after waiting si many days
And putting correct details it's still showing invalid.
I spoke to customer care aldo..they said to speak to the sender who gifted me this but she also can't do anything..she sent same card again and it's showing incorrect again.
How can that be possible.
This is merely Making people fool.