Caller's name is Graven, Austin & Drake.  From their website:  

"If you have received a call from GAD, it is likely because one of our clients has an existing business relationship with you. However, if you would like to be removed from our calling list, please send an email with your phone number to: dnc@gad-inc.com"

The BBB reports that GAD has complaints agains them for failing to honor a consumer's request to be added to their internal DNC list.  If you email them and request they remove your telephone number from their calling list, save a copy of your email.  If the calls continue after you email them, then file a complaint with your state Office of Attorney General's Do Not Call administrator, or if your state does not have a DNC list, then file a complaint if you're on the National Do Not Call list at www.donotcall.gov