Abuse of elderly and fake allegations by attender how to proceed now

I hired an attender for my elderly disabled parent. He assaulted my parent while we were caught up in the middle of a family medical crisis and my elderly father was alone at home. Via methodical questioning, and in front of the agencys service representative my father testified he was assaulted. Instead the agency took the attender away, the agency had him submit a fake allegation he was assaulted and he was leaving out of fear and hence refused to take action. How do i protect my family and myself from extortion or false complaints, without worsening the situation. Please advise.