Same happened to me. Instead, click on the invoice. At the top of the browser page, click on the END of the URL. Add this: ? action=cancel The ? should be right next to the very last letter of the URL, then a space, then "action=cancel". Hit ENTER. A popup should appear giving you the option to cancel. It does work! This happened to me TWICE on Tuesday, one for $50, allegedly from WHO, and $100 from the I R S (yeah right). Worked both times.
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