I filed exactly 7 days ago, and it was easy to cancel the authorized electronic payment by calling the number you listed above. Things changed for us when the Covid 19 crisis response hit the economy and we want to take advantage of the extra time granted to tax payers to make their payments. The woman who served me was very polite and thorough and even asked me to repeat the confirmation number for the cancellation, and instructed me to hold on to it for my records.
