Blasian

I purchased a Supercharger (for a car) along with other car parts. The item is coming from Singapore to the United States. The item has been sitting on 'Foreign International Dispatch' for months..By the way it is 'Registered Mail' according to USPS tracking. Im talking 6 months now its been on the same status. I lost contact with the seller and have contacted the singpost (in which what the seller used to ship) and they told me I need to contact USPS. I contacted USPS and they mentioned "if the item was in customs, it would say so, more than likley your item is lost or still traveling" ... Usps and singpost has put in a request update to customs but got nothing back.

What am I to do???