Hope you told them to f. off !! This is just ridiculous. This is a DIY project, you explained it very carefully and said several times that everybody who isn't sure about what he is doing shouldn't do it without the help of an electricien. They are pretty pissed off because you showed them that their products are extremly overpriced!!
Just ignore them...they have absolutely no legal possibility to stop you!
Just ignore them...they have absolutely no legal possibility to stop you!