Aparently, this is your mistake, and the buyer paid for postage.
This happens (If there is any lesson, you should try to avoid this situation in the future). Your right way is to refund her $3.5 immediately for your mistake.
If you want to do a good business, your way of handling things will just create disaster.
Just a piece of advice.
If you want to do a good business, your way of handling things will just create disaster.
Just a piece of advice.