I bought Minecraft: Java Edition for my Windows 10 laptop and it was working perfectly well and I could play it, but I came back an hour or two later and now when I open the game it only allows me to play the demo, and it undid the change I made to my username/gamer tag. I went onto my Minecraft account online and it says I do not own Minecraft yet but the £25 is still gone from my bank account.

Can anyone help me?