Dear Mr./Ms. Bossname,
Thank you for accepting my resignation, which I had intended to be effective May 30. However, I’ve been informed that the company would like me to leave immediately.
It was out of respect and dedication that I gave two weeks’ notice, which is not required by law. While I am surprised that my assistance is not needed, especially in regard to my client base and specialized account knowledge, I will of course vacate my office by close of business today as ordered.
I expect that you will find my files in order. If you do find that you have questions or issues moving forward, I might be available to consult at a per diem rate.