FedEx Made A Mistake With The Label And Sent Item To The Wrong Address?

OK, so I sold an item online on eBay, packaged it up, and brought it to FedEx. I filled out the Ground form with all the proper information including address, etc. The address was also written on the box with Sharpie.. Yesterday, my customer contacted me, saying that the online tracking information showed the item as being delivered, but it was nowhere to be seen. They called FedEx to inquire as to where the package was, and FedEx told them that the item was delivered to a different address. My customer went to that address that FedEx had told them it had been delivered to and found the item on the doorstep and took it back. I wrote the correct address on the FedEx Order Form as well as the box, but the label that FedEx printed out in the store had a completely different address on it for some unknown reason. Luckily, the item is in the right hands now, but I think FedEx should be reprimanded for their poor service. Do you think if I call them up and explain the situation, I could get my money back? The package was insured, but it wasn't lost, so I'm not asking for any insurance money, I just want my postage back.. What do you think? If my description was confusing, I will make it a little briefer: FedEx copied the address wrong when creating the shipping label, and therefore they delivered my box to the wrong address.