I tried MP...both before and after the election, but both MP offices couldn't do anything once IRCC said this is non-routine. IMO I call that non-routine a bs, it's just a get out of jail free card for IRCC to not do anything.
And for mandamus, like armoured said, it's a little by chance. I've also posted previously that I talked to a lawyer and she actually talked me out of doing it, even though she would get the most financial benefit out of the situation.