Yeah that’s correct, second um there was similar situation before. Same scam just like you had.
This is the LINK of the guy who got scammed just like you by same Seller.
Well, you can read that topic, and send a message to that guy who got scammed maybe you will get some more info.
There is a lot of scammers around Gameflip and some of them are easy to spot. I’m suggesting you to buy from someone who have good active reputation like Steam Pumpkin for a example. He’s selling various gift cards, subscriptions for Xbox Playstation etc etc. This is Steam Pumpkin’s Profile.
And for the last wait for that answer from Support, you can ask @DunnBiscuit for some help and that’s pretty much it for now. I hope you will get refund or something.
Regards