You can inquire about or cancel an IRS Electronic Funds Withdrawal using the phone number found in the last paragraph here....if I remember correctly, its all automated, you dont have to wait for a human.
https://www.irs.gov/payments/pay-taxes-by-electronic-funds-withdrawal
♪♫•*¨*•.¸¸♥Lisa♥¸¸.•*¨*•♫♪
