Here's what the FCC has to say about it:
Protecting Your Telephone Calling Records
"Your telephone company or VoIP provider may use your customer information, without your approval, to market enhancements to services you already use."
"Both Congress and the FCC have strengthened their rules to combat a practice known as “pretexting,” or posing as the actual customer or a law enforcement official to obtain telephone calling records. In some cases, data brokers offer calling records for sale on the Internet. "
Put these two statements together, and it tells me that unless you opt out, as you did, they might sell your info to all kinds of external marketers. They wouldn't need your implied consent to market their own services to you.
I'm really down on big telcos. They're not only soaking the public, they're killing themselves.