Well, if they are that disrespectful of you and your policies then I say good riddance! I know it hurts financially as you will have a gap in income now while you look for a new family, but this is ridiculous! Did they read the contract? Did you ever discuss that stats would be paid when they first signed on? I always discuss this in the interview so it is all out front and then I send them my contract and policies by email after the interview and once they have read it, they (and I) decide if we want to proceed to signing the contract (and bringing the deposit cheque). You will find someone who appreciates you enough to follow your policies. Most people get paid for stats, why shouldn't we?