Stupid Mistake By Federal Express

I have a friend who ordered a part for his car and it was shipped by federal express. We had already paid for the part and federal express never attempted to deliver it to the house it was delivered by federal express to the post office who in return for the stupid mistake by federal express charged us $7.95.  The guy at this address wants his 7.95 back because it was not his fault they delivered it to our post office when his address was clearly on the box where it was to be delivered. We are not very happy for their mistake as to why they cannot deliver the packages to the right address. Jane Lapham