I posted the warning 10 days ago: “Amazon GC discounts too good to be true”:
There’s no way around this: if you’re buying high-value Amazon card at 10+% discount it means seller is dealing with STOLEN GOODS, buy it on your own risk - Amazon can and will confiscate your entire balance and is very likely to ban you altogether. GF support will probably refund the card you bought here, but no one will help you on Amazon side