Additional Notes: I advise not to deal with this user. His telegram id is @GiftNerd
Let's say, your $20 falls into the sea and is swallowed by the fish.
This is an experience for you, in the future do not easily trust trading related to money via telegram, for now telegram is the most cases of fraud victims.
It's still a good thing you lost $20 for one card, what if you give him $2000 you must panic, in the future if you want to trade, ask in this forum section (services, goods etc.), so you get justice in that and also avoid being scammed.