DISCLAIMER
This is from personal experience only. I am not an attorney nor do I work in the legal field. I speak only from personal experience in the legal system and sharing with you what I've been told. Be sure, before you act on anything I say, to educate yourself on the laws, rules, regulations, and so on where you live, before you run off willy nilly with a 'plan' that will suck in your situation
/End Disclaimer.
Find out who the area manager is. Right now you're dealing with drones and, most likely, the area manager will be one as well. But contact them both by phone and with a certified letter. NOBODY likes getting a certified letter at work and they will be forced to do something. It might not be to your advantage but you will have a record of the notification. Make sure you document any conversations you have with the business and make notes on what was discussed and the resolution that was reached or not reached. Not saying all of this will do any good but it might and I'm going to place a heavy emphasis on 'might' bring about the resolution you are trying to attain.
Lastly a lot of people think that recording a conversation is not admissible in court. This is both right and wrong. You can record conversations so long as both parties are over 18 and one of them knows it's being recorded. A good lawyer might get the recording thrown out but it will be admissible in a deposition.