Needing charge back advice amazon

Hello, recently I was given a decent amount of amazon gift cards for the holidays from a family member. When going to redeem these gift cards amazon did a balance hold and froze $2k worth of cards on two amazon accounts. I called them 3 times and kept getting told I have to wait for amazon to "investigate" the problem they created. After a few weeks went by I got an email saying i bought these from a "third party" and cannot use them.

Spoke with the person who gave me them and they were kinda pissed. It recently came to mind that i had bought a nice collection of coins a while back and I was wondering if it is feasible to do a dispute on this purchase (aprox $1700 total cart size).

When i say feasible I mean:
1.) Is it legal / am i within my grounds to do this since I have talked with the merchent and they failed to resolve the problem.
2.) What do i tell the bank/payment processer? as this was a purchase made on a debit card

I'm confused why doing a charge back on the coin collection has anything to do with this. Sorry if I misunderstood, but are you really asking if it's legal to scam someone else and charge back because you felt Amazon didn't resolve your problem?

Amazon clearly won't accept these cards, and these were a gift you received, so you're not entitled to a refund from anyone in the first place. It sounds like a shitty situation, but your friend should be the one trying to get a refund, replacement, or charge back whoever sold him these cards. But I'll take a wild guess and say these cards were probably purchased in cash or bitcoins, from a shady seller, so that probably isn't an option.

last year i too did the same for $200 gift cards they never added money and never responded in my favour, finally i had to let it go. there are people who redeems these cards in market at some % and give you cash if you do some research. But again, use your head, chargebacks cannot be done as gift cards are one time purchase with policy of local store seller or wherever you buy them from.