You should discuss this with a Rav that you are sure knows how to handle such situations. (not every Rav knows how to deal with this).
Just so that you know, ACS has the potential of messing up someones reputation and life even if ACS finds that there is nothing wrong. (a case gets opened, and stays open for at least 6 months, afterwards there will always be record of the case).
Also, calling ACS for revenge or for personal reasons can get you in jail.
I know of an organization that follows a Ravs guidance, they have called ACS a lot of times. However they claim, that when you need them, they are ineffective, when you dont, they mess up the families life.