Even if we give you the benefit of the doubt in that this is a huge misunderstanding and fault of your web designer, as a school owner, you have the responsibility of knowing and controlling what is on your website. I would argue that this is one of the most important things you can do for your business as it is how EVERYONE out there will see you. I run two websites and I don't do any of the programming, design, etc. However, every word that goes up on my sites is written by me and approved by me after it is up.
I do nat handle anything with the marketing/advertising for the school including the website. I'm no good with computers and I have other things I have to attend to.