Fedex — Customs clearance delay.

My package with tracking number[protected] is stuck at customs clearnce for almost 15 days now. I have kept nearly 10 emails to the fedex executive but there is no proper response.I have already did my KYC as requested and also emailed them declaration letter. The package contains very important legal documents. Its shipped with International priority but gone into a waste. Im not going to use fedex dor any of my future shipments.