A very concerned bride

I am shocked and apaulled at the service I have received from the American Swiss hemingways branch. I sent my ring in for repairs. All that was required was a small little diamond to be replaced in my engagement ring . They assured me it was not a problem and it would be returned to me in a maximum of 3 days. This was on the 2nd of December, it is now the 17th. I have tried on various occasions to find out what is going on, all to no avail. I have visited the store and made many calls of which I now recieve no answer. I even attempted to get some assistance from headoffice which also turned out to be fruitless. I am extremely upset and concerned about what has happened to my ring. We have given so much business to their stores, but no longer will I be giving my business to a brand with such poor customer service. This is over and above the fact that the stone fell out and I had not even had the ring for 6months. I am getting married in the beginning of January and I have no ring of which to get married with.