I am trying to buy premium currency for The First Descendant but every time I try to buy it, steam rejects the transaction. I've contacted them 4 times so far and they just keep telling me that there are some "unusual activities" regarding my account and that I am restricted from buy anything specifically in The First Descendant and whenever I try to ask for more details, they just tell me there's nothing more they can provide and just close the ticket.

After searching around for a bit, I found out that there are other people who have had the same issue. Why is steam sometimes blocking transactions for this game specifically. Please Help!