I am running a sale on my shelf and had a person order some books and then they took advantage of my sale.  I needed to redo the weight due to the free books.  I went to put in the weight and realized when I went to print the label that I had put it on the wrong book (was trying to do multiple things at one time) so now the book that I mistakenly put it on has way more postage than it needs and I can't figure out how to go back so that I can get a refund on the overpayment so that I can print a correct label.  I sent a message to the help desk but was just wondering if anyone else had ever been in this situation and what they did.

Looks like double posts are happening again.......

I once printed the wrong postage and, following PBS guidelines, I sent in a message about it right away. They canceled the charge. This is just one reason why I usually only mail out one book a day. I remember once printing the correct postage for two books but inserting them into the wrong envelopes. I don't remember how I realized that but I had to open the envelopes and switch them out.