Just got a call from this number at work. Answered and no one there. Dead silence. I dialed back and got a recording saying they are calling about a subscription renewal and if want to remove number from call list leave a message. I left a message. Let's see if that takes care of it.
UPDATE: I received another call today so leaving a message asking to be removed from their calling list as I stated above does not work. I receive these calls at work and unfortunately cannot block calls. :(