What legal action can I take on individuals repeating false rumors about me in my place of business?

I was accused of forcing a woman to grab my penis and perfrom sexual acts. At the time there were a total of five people in the car. This lady and one other female went to police to file a report. When asked what happened the second woman said she did not see anything. I was never contacted by the police of the reoprt. I am a vendor at multiple facilities, one of which this person is employed by. I was made aware of the coments made by this individual. I contacted her manager and explained what may happen if this made its ugly head public. She agreed and put a stop it. Now a month later, in a seperate facility the second woman decided to start the rumor all over. I am worried again this may get back to a customer and affect my business. I just want it to stop so I can get on with work.