What do you write diagonally across IRS bill to quit and decease

You don't, you call and cut a deal that doesn't kill you. Or have a brief case full of evidence they are wrong! Bet you throw rocks at hornets nests too!

Decease = die

Desist maybe?

You need to get competent professional tax help to deal with the IRS, or just pay the IRS bill (which, in the long run, may be cheaper),