Taking forever to delivery packages and no communcation

My package has been at the Cape Town facility since Wednesday, 29 April. I never got an invoice for tax & duties, just a release form stating the amount owed and I paid it into Fedex' bank account. I have been sending emails and asking over and over the status of the package, but no response. I don't understand why the package can't be just delivered as it has been sitting at the facility since 29 April and today is the 4th of May.