Welcome to YT!!!
I know what you mean about asking for your money back. I would have the same problem myself. I think you really should try to call. I really think the pup is going to get bigger then you want. We have a 14 lb that came from parents about 7 or 8 lbs. Also look for a very tiny nose, not the muzzle, but the actual nose. A breeder told me this years ago and it did help me with our second yorkie. I wish you the best of luck no matter what. Please keep us posted.