Network Solutions (domain name registrar). They've become aggressive in the last few months even toward existing customers. Every time you renew or purchase a new domain, they try up-selling the hell out of it and repeatedly calling you to take a survey. They don't stop until you take the survey or blast the hell out of a telephone attendant ... until the next time you purchase something from them. Because they seem not to get the point (or don't care), they've just lost a long-time customer who's never used another registrar since his first domain purchase in the 90s. I'm actively looking for a new registrar to which I can transfer all my web properties.

Yep, must be Network Solutions. I just called a problem in with them yesterday. Today I get a call from this number. I didn't answer and no message was left. Josh is right, most of these domain name registrars are aggressively up-selling. Register.com is the worst of all in my experience. Two minutes after registering a domain name with them (and providing my new phone number), I get a call from Web.com, a web building site. I call Register.com back to complain and they admitted they "offer this as a service to their clients". I told them to take me off that list and they said it will take up to 30 days. What a joke! I will never use Register.com again and certainly not Web.com.

WHEN I GOT MY NEW TELEPHONE NUMBER I HAVE CALLED NETWORK SOLUTION USING MY NEW PHONE NUMBER SUDDENLY, PHONE CALLS STARTED POURING IN FROM 213-623-0000.

ONLY NETWORK SOLUTION CUSTOMER SERVICE AND/OR THEIR ANSWERING SERVICE OVERSEAS ARE THE SUSPECTS. THIS ALSO COULD BE TRUE WITH ANY OTHER COMPANY'S CUSTOMER SERVICE OVERSEAS THAT COULD COLLECT YOUR PHONE NUMBER AND SELL IT TO OTHERS LIKE 213-623-0000.

I DID NOT CALL ANY OTHER PUBLIC COMPANY SINCE YESTERDAY, WHEN I HAVE GOTTEN MY NEW PHONE NUMBER EXCEPT THE NETWORK SOLUTIONS CUSTOMER SERVICE.

Must have been network solutions according to the replies here.  I just called them yesterday to upgrade some things on my account.  They should be more upfront and they might get a better response!

Yes.. here also.  I'm a Network Solutions customer.  They were following up on a trouble ticket I posted.