another pesty person/company - am not interested in who this is and want calls to stop

I get calls from this number daily, when i answer no one says anything. if i don't answer, they don't bother leaving a message. they are calling my cell rather than my home, so i am wondering if it's a telemarketer.

they have called me and another friend atleast 4 times in the past 2 days. claiming they are some vitamin company and tried selling me viagra. everytime i try to tell them i don't want them to call they hang up. they try to ram their info down your throat and be fast and slick about it.how do u block them??

here's some more details on this asshole Felix Ceballos 846 Beck St Bronx New York 10459

I am getting several calls a day from this number. No one responds if I answer. I have been on the DNC list for years. I would love to get this group from calling me constantly. I am recovering from cancer surgery and it is difficult for me to get to the phone as I am on a walker.