minding GC stopped for extra nursery hours

has anyone on this forum been told less than 24 hours notice that their GC is now enrolled in nursery on the only day you see your GS while other granny still does her day each week. if so what did they do about it. We have had no rows or anything and have minded GC for more than 3 years sometimes at very short notice. We are both very upset and feel we should have been spoken to earlier and discussed the matter. Seems we are not important anymore. We have a very close relationship with GC and are totally baffled at this change.