Lost ring and Pathetic customer service

Pathetic customer service!!! I sent my ring in for resizing about 2 weeks ago. I was contacted at 4:30 on a Friday by the manager to tell me that they had LOST MY RING! This is my engagement ring! The ring my fiance used to propose to me and now it's GONE! How on earth does that happen? But that is not my issue with American Swiss. It is with the way they handled the situation. The manager is so rude she makes me feel like I am being a nuisance. When I try to explain why I'm upset she talks over me and tels me I am wrong. I then obviously got angry and she then put the phone down in my ear and now ignores all my call and emails. I have been trying to get hold of anyone in head office that will be able to help me. But I keep getting empty promises. This has been the worst experience I have ever had.