First Source Advantage unacceptable practices, harassing neighborsf buffalo , New York

First Source Advantage 716 564 4905 is calling and harassing my elderly mother and asking her to get a message to her neighbor (she doesn't even know the renters who live next to her).  Her neighbor evidently owes money.  However, my neighbors financial troubles HAVE NOTHING to do with my mother so First Source Advantage should not be calling her several times a day!!!!!  I have filed a complaint though the no call list and will contact whomever else I can think of.  Maybe write a letter to a Representive?  Call the police?  They will not get away with this.