It depends on where you are, contracts, etc. But if you can do the bare minimum to not get fired, that’s what you should be doing anyway, and they might even fire you for that.

They might make something else up, but you can fairly easily fight something like that and get what you are owed (eventually)

To my knowledge, not having transportation to work is a valid reason to collect unemployment. If the office you're suppose to report to is an unreasonable distance from your house, I think that should work

Sometimes making large changes to your working conditions and role are considered a soft form of firing. It either is, or is in the neighborhood of, constructive dismissal. It really depends on how friendly your state is to labor, though.