If you have a problem with your FedEx package, the best way to deal with it is to contact FedEx customer service. You can call them at 1-800-237-4444, or you can go to their website and fill out a form. FedEx will investigate your complaint and try to resolve it.
If the problem is with the package itself, FedEx will send you a replacement package. If the problem is with your address, FedEx will send you a new package to your correct address.