Had a phone interview scheduled and the company emailed me 12 minutes before the interview to tell me the position was filled and was offering a “floater” position. Best way to reject?

Hello, I want to give more context. The position was for a Physical Therapy Aide. I had a phone interview for the position today that was scheduled a week in advance. I’ve had several years of experience, but HR emailed me 12 minutes before the interview to tell me the position has been filled and that they have a “floater” position available in an hour away from me. What would be the most professional “fuck you, I am no longer interested”?