This number is a SCAM. They are trying to look "official" and send you a notice about your domain. I just wasted 15 minutes of my time making sure the actual domain was up to date. Then I reported this and now I am here warning all to beware. Thank you for wasting my time.
They fax these out, e-mail them and even send them snail mail. Can you believe $75 for a single year .com registration??? And people fall for this. They harvest info using "whois" database so they have names, e-mail addresses, phone numbers, and street (or PO Box) addresses.
DO NOT BE FOOLED. These are rip-off artists... no, not even artists. Just jerks!