Lost package since September

Had a package sent to me from San diego to virginia, went out for delivery on September 16th, then back to roanoke distribution center, it spent about 2 weeks going back and forth from roanoke to Memphis, and has now been sitting in Memphis for over 3 months. I've reached out to usps to file a claim and missing mail request, where they continue to assure me the package is not lost and is only delayed. They have not reimbursed insurance or anything. I can't imagine I'll ever get my package but how can I get the insurance money back