What to do if I got a cease and desist letter?
The first thing you should do is make sure you don't ignore it. If you ignore it, that might be used against you later so it is important to treat it seriously.
Another thing to do is to keep in mind that a cease and desist letter is not the same as a lawsuit. It may eventually turn into one, but for now, it is not.
The best thing to do is to read the letter, see what claims the letter is making, and then get an attorney to help you with a response to that letter. It might not be the cheapest way to handle the situation, but it's important to get out in front of this and a lawyer is going to help you do this.