I just received a call from this same number regarding "renewing" our expiring SSL certificate. I let it go to voicemail like I do with most of my unsolicited calls, and it was full of alarmist words about our certificate expiring next month (I renewed it this morning actually).
Stick to your regular known companies for renewing your SSL certs and ignore these calls.
The phone number belongs to Comodo Lltd who issue SSL certificates under the brand names Comodo, PositiveSSL, and InstantSSL.
We've never used any of their services or signed up for any of their mailing lists and yet we receive unsolicited sales calls from them. Not only do we receive unsolicited sales calls but we are deluged with SPAM advertising emails from these clowns. This weekend alone we received 31 SPAM emails advertising Comodo's SSL certificates.
As a result of their unsolicited telephone sales calls and mass spam I will never do business with them. What I do plan to do is file complaints against them with the FTC (both for their violation of the do not call list and their spam emails), and complaints with the New Jersey State Attorney General and a sepate BBB complaint for each of the 31 spam emails I received.