I have an amusing letter from the lawyers working for powerinsole threatening legal action for asking questions and that I should remove all my comments from so

I have an amusing letter from the lawyers working for powerinsole threatening legal action for asking questions and that I should remove all my comments from social media. It was also demanded that I pay approx 350 euro that the letter cost to write. My response was to invest in the cost of the device, tear it down on video and post the analysis to facebook. That was more than 6 months ago. I have not heard from the lawyer since. I'll happily go to court with a printed t-shirt with the text "where is the battery?" but it won't come to that I guess.