[Krangry]

I had one where i had to pay 75cents, i just sent a nice message letting them know what happened so it didn't happen to more people.

For most its a honest mistake. The person that did it to me was more the apologetic so that was more then good enough for me, and i left good feedback.

For some people a dollar is more then others, may have him paypal you the money as a gift or something if they are open to that as well.