If you notice the mistake before 8:30 pm ET on the same day you paid the bill, you can delete the payment online:

1. From your Accounts page, select Move money
2. Select Pay bills
3. Select Pending payments
4. Under the Pending section, reverse the incorrect bill payment
5. Set up a new bill payment for the correct amount

If you don't notice the mistake until after 8:30 pm ET, please contact the merchant you're paying for support.