SWISS AIR: 19 days & they still have my luggage

I’m a resourceful problem solver but need your sage advice (not “don’t check luggage”). Returning home (Seattle) from RS Italy tour, 110-minute flight from Naples to Zurich was 40+ minutes late leaving/arriving (I handed over my bag 2+ hours before scheduled departure; carried on tech, jewelry, meds, etc). After 20 minute wait at Zurich luggage carousel, sign showed “luggage delayed”. Agent helped me file Delayed Luggage form before I sprinted to board Icelandair flight to SEATAC. Received email same day that luggage was found in Zurich and they (tbd) would contact me about delivery. To expedite luggage reunion (leaving on another trip) had told the original Zurich agent I’d pick up the bag at my home airport (SEATAC). Agent must have written Zurich pick-up instead (though doesn’t indicate such on my copy of the form, or on the email I received). I've made 10 calls to Swiss luggage. Was told twice that they’d expedited it, but the claim was closed after 8 days. As directed, tried to file new claim but system won’t let me because original still in the system, though can’t be altered. Told to contact Tech Support. They put me on hold for 15 minutes & routed me back to luggage support. As directed filed “Feedback” both online form and voice mail. Will get back to me in 30 days. Two agents gave me Feedback numbers that are no longer in service. Have asked to talk to supervisors “there aren’t any”. Requested that my calls be documented “can’t because claim is closed”.
Flight insurance covers what the airline doesn’t. Reimbursement for replacements during delays, but many clothing items not generic; gifts, etc. purchased in Italy. Insurance Lost luggage claim can only be filed after airline deems luggage is lost. After 21 days can file Swiss Air Lost Luggage form but system won’t let me since Swiss Air says my luggage was found…and remains in Zurich. Another circle for Dante.