IMHO its doesn't matter who you are. You don't need to be a layer to protect yourself in the right way. if you send a letter with evidence, certified with return receipt, if as a business, or a person, this is a good chance of liability if you don't respond if it ends up in court. There can be consequences for non-reposes. I have always had good results using this method. But you got to be clear about:

A. What the problem is B. Why you think there should be a response (I.E: What could happen if a response does not get acted on from your perspective, what harm could be continued, ect.) C. Set a requirement for a resonable response time and some kind of fee schedule or possible outcome if there isn't a response in a reasonable amount of time.