Not every rehab ends immediately after your ninth payment. It takes time to transfer your loan to a new servicer, and that process may only happen once or twice a month. There may also be delays if there isn't a servicer available to take your loan, or if the DoE computers are experiencing technical difficulties (which isn't uncommon).
I would call on Monday and ask about the status of your loan. Be prepared to make a 10th rehab payment if there's a hold-up in processing, but chances are they will get you transferred to your new servicer before then.
