Dissapointed with Fedex services

I would like to express my disappointment with Fedex. I have a 1 page document that was sent from Zimbabwe to South Africa on the 18th of September and l still have not received it 3 week later. On the tracking app its showing "clearance delay" for a week now. I have called 4 Fedex customer care representatives and there is no help. The one l spoke to yesterday tagged me in an email to customs asking about the status of my package and when it will be released. The email has not been responded to and it appears that the email address is a group email and no one bothers to check or respond to emails sent there. I spoke to another Fedex agent again today and she told me that email address was my best chance at getting a response. All l need is an explanation on why a 1 page document has been held up for over a week now without any explanations. If the package had some other goods l would have understood that maybe its about under-declaring goods or something else. But a 1 page document being held up for over a week baffles me. The reason why l used Fedex was in the hope of receiving my document as early as possible. If l wanted it to take this long l would easily have chosen other service providers who do not promise to deliver your package in just a few days. What bothers me so much is that the Fedex agents appear to have no power to follow up with customs and l just have to sit tight until they decide to release it. I wont be using Fedex ever again.