There is no Minecoins after I paid!

After playing Minecraft for a long time, I found out the type of Minecraft that I bought actually contain 1600Minecoins, but I never use them before. So I decided to go to the Marketplace to buy some resources. However, when I go to the market, it showed I got no mine coins. This confused me, after many times refreshing the pages I still don't have any mine coins. I am pretty sure I paid the 40$ Minecraft one, so pls tell me there is a way to fix this!