The situation is as follows:
An e-mail is sent to the people scheduling an on-site interview notifying them that I would like to cancel the interview. However, the day of the interview, there has been no reply to the e-mail or acknowledgment that they received it.
What is the most polite way to ensure that the people coordinating the interview know that I am no longer interested in the interview? I am aware that if they did not receive it, it would likely seem that I was a no-show, which would reflect poorly on my future prospects should I wish to work at that company in the future.
Would it be best to directly call the person who coordinated the interview via a phone call?