Called at noon PT on a Sunday
CID: SSI
Caller type: (no message left)
I called this (local) 619 number and received a recorded message that they are conducting a survey. A nice way to access (i.e., annoy) members of the DO NOT CALL registry.

Surveys are exempt from the DNC registry. It's for telemarketers only.

You are correct. Also most political organizations and charities
But my point was this makes them no less annoying. Right?
Call blocking doesn't work because they called back from a different number the next night.
Anyway, if you call them back they will give you the following email address to request an opt out -- provided you add your telephone number to the body of the email.
optout@surveysampling.com

Their website:
https://www.surveysampling.com/contact/opt-out-do-not-call/

In your original post you stated "A nice way to access (i.e., annoy) members of the DO NOT CALL registry." which would indicate that you were not aware of the fact that the DNC is for telemarketers ( people who sell things) only.  So Tygerkat's reply to you was appropriate.   I am glad you found the website to remove your number from their list.  I am told by others that it does work.

Sure call blocking works. Especially if you can block the entire area code.