having a camera rolling would be good. if you request their supervisor, If the supervisor is available then they are supposed to get that person. the way to call for the supervisor is by calling 911 yourself. i have done this to a cop and he was doing fire station work the next time i saw him like a week later and used hostile language in a non-hostile fashion in casual speech in public in front of me.
you gotta be quick about it though. timing. if you can position them already in the wrong so when supervisor is called it is for a wrongdoing you alledge it will get better attention.
e, i longboarded across a intersection with proper ettiquete and he told me to ''get off the board'' and i did. and then i got back on in 5 feet when i reached a parking lot. he yells ''what are you doing?''. i said, '' its privae property'' he said ''no it isnt'' so i walked it. he talked out the window while i left and followed me maybe 70 feet. so i stoped and he had his window up. i looked at him 20 feet away. he rolled the window down and said, ''you have a problem?''. i judged he was feeling friskyer so i got on my phone and called 911 and asked for his supervisor. when he approached me he didnt take my phone from me, he knew i was on the phone with the police. editedit, he walkie talked to cancel it. sorry for missing this but he did and his captain who i talked with,, i dont think she liked that.
what he did was reengage with me after i stoped/stoddown/did what he asked.
next day or so i explained all this to his captain.
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