I get paid in advance too and my contract states payment is due on Fridays by 5 pm for the following two weeks. I only accept cash or emt .... No cheques! I like Fridays so I'm not wondering and waiting plus I do my grocery shopping on the weekends and want the money in my account for that purpose.
I agree change your contract regarding notice .... Something like will give as much notice as possible. ..... I feel that these people were in breach of contract when they didn't have backup care .... They could have taken the day off but they wanted to prove a point to you .... The point was they they were in control .... But if they really couldn't take the day off cause they didn't have back up care ... Then what the hell are they doing today and tomorrow ?.... Point is parents can take the day off when it suits them .... Be thankful they are gone cause it would have never gotten better .