Ok, you could take this to court on your own, but it's a long shot.  The first thing you need to do ask them to provide a copy of the list of date that your DH took off.  Then compare your list to your DH's time cards (even though it electronic, they are required by law to print one for your DH).  Basically, check the dates you took off with the dates on the time card.  If you worked on those dates, then there's your proof, and the DOL can get involved because they're actually messing with money you've worked for.