Cancel permit for Coyote Buttes

Hello! Something last minute came up and I’ve tried canceling my permit for Coyote Buttes. I’ve emailed the address provided on my paperwork, and I’m not able to cancel online on my recreation.gov account, the option isn’t there like the directions tell me.

I’ve never had to this before so what is the penalty for cancelling? I have a paper trail of me trying to get in contact with a rep but no luck in actually speaking with someone. Is there a phone number I can call?

Thanks in advance. Please be nice.