International delivery

I've lost my patience with FedEx my parcel from china was checked in customs last week Thursday 11 Jan 18 i called them same day the agent i spoke asked me to send supporting documents I did that with no response upon receipt i called Fedex on friday 12 Jan the agent told me they have no update from customs, on monday 15 Jan, 16 jan still no update from customs, yesterday i called again another agent told me clearance takes up to 3days she promised to send them a follow up email and asked me to check next day. Today 18 Jan 9am I called Fedex again the agent asked me to call after 1pm then the customs systems will have updated but guess what i called at at 2pm still no update i'm so fed up right now. i will never use Fedex ever.