Purchased diablo 4 presale and now wants me to pay again

So I purchased this game on presale and didn’t play for a while after. Now I have a new computer and it says I have Diablo 4 active, but I can’t download the game without it telling me to buy the game

You likely logged into the wrong account. You’ll need to contact customer support via ticket to sort that out, as this forum is only player-to-player troubleshooting for Bnet on PC.