I got layed off and was told if and only if I do another 20 hours of work to finish documentation would I receive 2 weeks of severance pay. I tried to explain s

I got layed off and was told if and only if I do another 20 hours of work to finish documentation would I receive 2 weeks of severance pay. I tried to explain severance shouldn't require extra labor but I did the work anyway and received ZERO severance. I knew that outcome was a possibility.