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 Bill Payments
2. Select Upcoming Activities
3. Delete the incorrect bill payment

You can then 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.