I work Saturday mornings. Weeks ago I requested this coming Saturday off work as DD and I have something to attend. Weeks ago I was told this was granted.
A couple of days ago a colleague who also works Saturday mornings had to start maternity leave early. Yesterday, work told me this means I cannot have the day off on Saturday as previously arranged, because they will need the cover arranged for me to now cover my colleague's shift. It's not a small office, but most don't like working weekend shifts because of their kids. I know there are others who could step in to cover for me if they really wanted to, I have offered to swap shifts but so far no one is willing to take me up on this. I have explained why I want this particular Saturday off work. Aibu to make a complaint? Normally I hate making a fuss but I feel they're taking for granted that I will always work the weekend shifts at short notice.