You will have to change your mindset for this type of thing to stop feeling personal to you.
All of the comments are about
services offered by your business, not you personally. It is likely this family is expecting a more structured, classroom-like environment, which you don't offer. It could be really quickly cleared up with a conference to discuss these parents' expectations and what you are willing to offer. It likely began from a misunderstanding of curriculum and daily schedules to start.
When they enrolled what were they looking for? What questions did they ask?