You need Congressional help
andrews,
I am sorry to hear of your plight. I think you need to get in touch with a Senator or Congressman from your area. TSC and the Miami office need to be held accountable for the mess they have created. My case suffered a similar fate as yours but last month an immigration officer at TSC confirmed that the cases are in TSC and not in Miami. If you call the NSC and talk to a representative and not an officer, they will just look at the online update and tell you that the case is in Miami. Only an officer at TSC can confirm whether the case is in TSC or not.
I don't think you should waste more time on this. Try to get help from a Senator and Congressman otherwise the TSC and/or Miami will keep playing this game with you.
Good luck and let me know if you need any information from me.
saras