Gave parents notice few weeks ago due to variety of reasons. they are still bringing their children to me (one more week left) but not speaking to me. in my letter i gave them invoice for final bill. I state in my contract Im to be paid on 1st month. no mention has been made of paying me as yet. Should I send a second reminder then if they dont respond by Friday tell them I wont be taking the children next week or is that too harsh?