I work in a Canadian school – compared to most people at least in North America, we have a good salary and great benefits. Not to mention a fairly strong union. I am the union rep at my school.
Recently, a coworker of mine came to ask me about bereavement leave. Our CBA allows a decent number of days, but most of them have to be taken immediately. They wanted them moved later, to take care of things instead of grieving – they expected the death. Fair to ask, even though the CBA doesn't permit it – you never know. So I suggested they talk with admin, but not to expect anything.
They come back to me, happily telling me the VP has agreed to move the bereavement days off. Right away I ask “do you have it in writing?”. They say no. I strongly suggest they get it.
Well, that was the kicker. VP asked principal, answer is negative, coworker has to take the days right away.
He sent a very incensed message to the VP that “If I didn't ask for it in writing, I would've gotten neither of those dates and be utterly fucked”
Always get promises in writing. And right away. Especially if they go against established rules.