Hi Tony,

When did you file the extension? It may be a matter of timing.

You can check the PDF of your filed 4868 to confirm the payment was setup to be withdrawn. ProConnect Tax Online support has no record of when electronic payments are being withdrawn. 

To find out or cancel a payment, call the IRS e-file Payment Services at 1-888-353-4537 to inquire about or cancel your payment. Please wait 7 to 10 days after your return was accepted before calling. See the IRS Pay Taxes by Electronic Funds Withdrawal under the Cancellation, Errors, and Questions section for more information.