If you have already authorized CBP via ACE to do an ACH withdrawal for a statement you may cancel or nullify the authorization of said payment.
However IT MUST BE DONE WITHIN THE SAME DAY! CBP will not allow you to cancel an ACH authorization for previous days.
From the Main Menu go to.
Customs Brokerage
Automated Broker Interface.
ABI Statement Menu
ACE Negate (Nullify) Statement Payment Xmit
Enter the Statement# you wish to nullify.
Enter T to Transmit
Verify the response from ACE using the Check Transmission Option in the Main ABI Menu.