That sucks, but you have legal recourse and are likely to get every cent back.
The Feds took almost a year to pay me the $700 theybowedbmenwhen I resubmitted my taxes due to forgetting to add one item I took a loss in.
On the good side, I did recently win the 4 bogus parking tickets that I've gotten in the last 6 months. So maybe I'll have good luck with this too!