[pierrem15]

a) I doubt the threat to withhold vacation pay is legal-- from what I can see in Wisconsin it depends on what the employer has done in the past. If they have paid it in the past, they must pay you;

b) In some states, you can collect severance and still collect unemployment (Illinois, for example). I'm not sure where your state of residence is or from which state you will collect any UE

[NoGrayZone]

"In some states, you can collect severance and still collect unemployment"

I was shocked to learn, here in NY (don't know if it's still the case as it was many years ago) I could collect unemployment while collecting my severance.