Why would this job place lie?

I applied for headmasters receptionist quite some time ago now. I decided to call them up as the vacancies in still up on their website and has been for awhile. The lady said they don't have any vacancies for part time receptionist and I told her that i'm up on the website and they do. She told me the vacancies are now closed and it been forgotten to be taken down. Why is she lying or why would they deceive the public and make us apply for the role if it's not available anymore. And no they never forgot to take it down because it's been there for ages now