Question about APS case which started with false anonymous call

Hello. Recently, my father was contacted by JASA (NYC) based on an anonymous phone called made maliciously by someone in his building. My father and I (30s, male) live together. My father is in his early 80s but is independent. JASA did not do any proper investigation and, acting solely based on the anonymous call, instead contacted APS, which sent a threatening letter to my father. My family and myself, are ready to defend him, as well as all of our rights and interests. We would like for APS to close the case and notify us that it was closed. We need to know what APS could possibly do regarding my father's case. Do we need legal representation? Thank You, Brooklyn, NY