Sudden change in tracking details and huge customs delay

I had a parcel scheduled for delivery on the 21st of September.I waited in on the day and frequently checked the tracking details displayed on the app,which showed it was to be delivered on the 21st of September.Suddenly late in the afternoon the tracking detailschanged and displayed that there is a delay due to customs and the scheduled delivery date is pending.Apparently my parcel is still in Johannesburg. Later I was contacted by FedEx that I had to send proof of payment and other documents etc to hear back from customs.After I provided all the documentation,and after a long wait to hear from customs,I recieved a customs clearance fee almost twice the price of the actual parcel’s value.This is due to a penalty recieved due to misdeclaration which I understand. However, it was acknowledged that it’s the suppliers fault and not mine and to this day I’m still waiting to hear wether the supplier will be billed or not. Never once has FedEx told me how long a process would take (such as billing the supplier or customs clearance) unless I phone them directly.This is really inconvenient. I have recieved 2 parcels last week within 4-5 days from England (customs processed,cleared and paid and all) with another courier company however with FedEx the clearance process is nearing past half a month.I feel it’s unfair to write a 2 star review because I know this company is reliable and I’ve had good experience in the past,however the customs procedure needs to improve.