Sorry to hear about your problems, especially with your first. Believe me, most of us have been there. Unfortunately it is a normal occurrence in the rep game. There are no guarantees especially with movements. It is best not to confuse QC with a quick visual check. I work in an industry where QC is a whole area of procedures, policies and systems and I am quite sure this is not what the dealers are doing. Although they have come along way.
It appears that the weight has come free from the bearing. This is a pressed in part. If you can get the case open it is a pretty simple repair to at least get you going again. Just remove those four cap head screws and pull off the case back. Next pull out the weight to get it out of the way. Then you will need a small jewelers screwdriver (probably 1.2mm) and remove the screw holding the bearing to the movement. Once out (be careful not to loose the screw) you can pull off the bearing. Now set the weight face down on a hard surface, place the bearing in the hole then press it in. It should pop right in there. Then reattach with the screw and reinstall the case back. Good to go.
I know I know, sounds easy right....it really is. Good luck.