Update: Called the number back and received an automated message. ("we are allowed to all... blah... blah... not a telemarketing agency... blah, blah... blah...)
Anyway, the good news is that at the end of the message, the following phone number was given to allow you to remove your number from their call list. 800-864-8601. Simply enter your number and it should take "3 days" for your phone number to be removed.
(I'm assuming this is on the behalf of Enterprise Car Rental since it is referenced many times with this number)