That would be low of them but they already sound like scumbags so who knows. Right now you need another job flying. I recommend making that your primary focus. This may come up later though so make sure you save your medical records and a phone bill showing the calls as well as anything else that might substantiate your side of the story.

The good news is the 'mess up someone's record' game is common enough that most reputable employers will ignore a record from a known dirtbag shop. It is critical though that you make sure this doesn't happen again. Getting a second chance is likely, getting a third is less so. You don't want it to look like pattern behavior.