i received 9 calls in 3 hours, all unanswered by me.

Apparently it's from a company called Comodo; read this post: http://800notes.com/Phone.aspx/1-201-963-0004

Call came in on November 28, 2011. I see from the call logs that they have called frequently over the last two months. Never left a message - so it is a robo-call which will go to a sales person once connected. Upon research I found it is  Comodo trying to sell me an SSL certificate for my website.

Still making junk calls about SSL certificates.

Fortunately, there are plenty of better and cheaper alternatives.

Caller left a voice message. Identified themselves as calling from a company named Comodo. Wanted to discuss our web security certificate (from a different vendor) that is expiring next month. Knew exactly what certificate we had. Offered to save us money.

1) Spidering websites to gather information about security certificates is low behaviour.
2) Unsolicited cold-calling is low behaviour.

The company's motto (comodo.com) is "Creating Trust Online". I laughed.

Apparently they have done this before and in that case followed up with an unsolicited "scare tactic" e-mail: http://blog.loftninjas.org/2009/03/12/comodo-is-shady/