Sorry they are taking advantage of youit really makes you feel like crap. Been there and you really should have taken your time when you got the text. I don't carry a cell due to this mentality that people have that you will be at there beck and call ASAP and for me my policy is if you want to change your schedule you must give me 12 hours notice, unless it’s an emergency
You should let them know that they must give you ample notice of any changes or there will be an additional fee involved. I used to have a parent that dropped off at the most crazy times due to be on call and I hated it as it really can ruin your day. We have routines and activities scheduled for a reason!
Know that your not alone but you need to speak to these parents in person regarding this issue. How would they feel if their boss changed their schedule on them last minute?
Or how would they feel if at pick up your weren’t there due to taking your time at the park! LOL
Hang in there we love you!