Swiss International Air Lines review: No assistance baggage lost with medical equipment

We lost one of our suitcases on flight of Swiss Air LX737/LX8038 from Amsterdam (Schiphol) with a short stop at San Jose to final destination Liberia (Costa Rica) on the first of January 2024.

At our final destination at Liberia Airport we didn't receive one of our baggage. The staff of the airport told us to fill in a lost baggage form and says that was enough and would contact us within 3 days. After 3 days we didn't heard anything so we tried to contact the airport again, but they now told us to directly contact Swiss Air as the operating airline. Swiss Air is keep on asking for a lost bag reference number which we didn't get from Liberia Airport. Our bag is lost now for 12 days and we haven't heard any thing yet. We have tried to fill in a lost bagage form through the website of Swiss Air but we get an error. We have contacted the airport of Zurich, Liberia, Swiss Air all with no result.  It seems that we have been mis informed by the beginning and no one can help us out. Because we bought our ticket at Swiss Air, this airline should help us out!

We need help with urgency, among a lot of personal things there is medical equipment (diabetes glucose sensors) in the suitcase that we need for our 9 years old daughter soon!