I say send it. Unless you are getting a lawyer, it's going to fall on def ears anyway. I think your unedited anger will come across as intended. Make sure you add that you also put a copy of this on a few social media sites. These days, anybody that offers a service of any type is more afraid of bad press from social media than any other source. They will make changes just based on the possibility of getting a bad rep. GO GET EM TIGER! (oh, and move on afterwards)