It is up to the police to determine whether or not to charge someone with a crime based upon the evidence presented, if you presented them with evidence of assault and asked for assault charges to be brought, you would first go to speak to the supervisor of the officer and provide the evidence and that you want to press charges for assault. If the supervisor will not help, then you would need to go to the DA's office and present them with the evidence, since the DA has the ultimate decision on who, what, when and how to charge someone with a crime.
As far as their behavior, you can also file suit aginst them for their conduct in your business, the disturbing the peace and the damage caused to your business and seek a restraining order against both of them to stay away from your business and your person.
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