How do I cancel a purchase?

Last night was 10/16/22. I didn’t recognize I’d selected a purchase before starting the purchase. I thought it was just showing me the prices of all 3 Diablo IV editions. I didn’t understand I had to click on the prices as a selection to buy it was just information, not a selection.

As very last choice I have to make, I want to see a “button” to click on that says “Buy Ulimate Edition $99”.

It wasn’t clear enough to me that it was about to charge me and what it was charging me for.

You can’t cancel it, but you can refund it. This should take you right to the link
https://us.battle.net/support/en/help/product/diablo4/2090/2091/solution

https://us.battle.net/support/en/help/product/diablo4/2090/2091/solution