[jacquesm]

That really really sucks. This happens, fortunately not frequently. I take it you have copies of all the documents and the preceding correspondence as well.

First order of battle is to be candid with your current employer to see if you can get your old job back, you may have to promise them not to leave within the next six months or so, conversely you can expect to be let go at any moment.

Think of it as a stopgap measure.

Next stop after that is the office of a lawyer specializing in HR affairs.

Don't worry too much about looking ridiculous, you would look a lot more ridiculous losing your dwelling or having no food on the table.

Pride is a virtue but fairly useless at this point in time.