Good day! Faced with such a situation: there is a company "A", it has a service "AA." I have a website where there are a few articles about this service "AA". And these pages are moving on the key "AA". I received a letter (trademark infringement) from "A" that I was violating copyright and illegally using their registered trademark. Requirements: stop, remove, and never . Posted on my website adsense. In the ad units are placed direct competitors of the company "A". They do not advertise on google. The claim that I bring traffic to competitors. I have no idea whose advertising is placed there. That is, they forbid me to write on my website about their company. Are any products, services, etc. my site is not offered. Simple description of the company and the service "AA". In the domain name has no trademarks. Absolutely neutral name widely covering this niche. We are talking about the USA. Maybe someone faced with something similar. Something you advise or suggest me. Thank you. How should I proceed?