Interesting that based on your former profession you are apparently provided with a secure phone and number for 25 years. Also interesting that your former career skills don't give you the idea to search google to see that it is indeed a spammer or telemarketer. Sounds like the special dynamite needs to get over themselves.
Called and didnt leave a message but provides an opportunity for you to be removed from their calling list. Not sure what company it was or even what they were trying to sell...