They have an opt-out page on their website at
https://www.surveysampling.com/contact/opt-out-do-not-call/
Opt Out from Survey Phone Calls
* Email us at
[email protected] and include your phone number in the body of the email.
* Call 1-866-360-9563 from within North America or 1-801-379-4094 outside North America to be placed on our no-contact list.