About a month ago I discovered that I couldn’t delete a Power Platform PAYG billing plan. It turns out that now I can.
As you can see in the above screen shot the Delete billing plan button isnow available. Seems that because the paint was still wet on the features for this the team at Microsoft was making adjustments. However, I am now told this has been all sorted so you can delete your billing plans as you wish.
CIAOPS 