For future you may want to make your deposit higher. I make it a full two weeks fees....it hurts more to lose $420 than $150. Plus, it makes them really think before signing up. And if they do drop out, you have money to cover costs and time for advertising again. personally, I wouldn't think it is worth pursuing them legally as you will pay more in legal fees than you will ever get if you even win. Do you have a trial period in your contract? I have the first month as a trial, so parents could legally leave without notice during that time if they are not happy (as could I). If you have that, then they don't have to pay a month's fees.