ARG! Technology Defeats Me Again!

I must be the poster child for technological stupidity. I use on-line bill-pay. I went to make my car payment last month, and entered the amount in the wrong field, and sent it off, blissfully unaware of my mistake. I am sure the other company appreciated the extra money, but they aren't going to give it back. So guess who is going to be behind on his car payment for the next few months? Arg - and not in a piratey kind of way.