Fedex — Not received my delivery for 4 months

I have a shipment delivery coming from HOLTSVILLE, NY US. Shipment was sent to fedex on 13 December 2021. Initially, they said its pending for invoice. I have attached it the very next week, but also they havent moved from transit. Till now, 4 months have passed but I have not got a single update from any of your executives. Whenever I made a call, they will hold for 5 seconds and cut the call. This makes anyone anger who is trying to be patient.
My AWB no:[protected]
Requesting you to take appropriate legal action and deliver my shipment as soon as possible.