I agree good for you for taking the high road and maintaining your professionalism ~ it is hard specially when someone is throwing a tantrum at you ... some people just do not like being called out on their poor behavior even when it was done in a professional manner by just explaining that 'should you wish to continuing using 12 days of care I am going to have to charge a premium because my fees initially were based on an average 9 hour day cause it never occurred to me someone would choose to leave their child here for 12 hours I am open and expect to pay so little for that many hours of service'

Do not let people like that get to you .... the first year or so in this business is a learning curve as you perfect your contract and policies and learn from people like THEM on how to protect yourself and your business ... grow from the experience and move on!