I sympathise, that's as good as mine! I contacted somebody as she had an exact match on her tree, but after a discussion it transpired that she was only researching this person in an attempt to find somebody else of the same name, so her tree was not linked to mine at all.
Then a real cousin asked me who it was who had MY family listed - there we were, my mother and father, even my own name. I contacted her again, furious, and gave her two days to remove us from there before I got in touch with GR and really caused a stink.
I did get an apology and she agreed to remove her tree and prune it considerably before it was put back but she wanted to keep my branch, minus my close family, because of all the research she had done on it, as it might just help somebody else.
My response to this was truthful ..... her tree wouldn't help any other researcher since it had a major error in it!! I think that stumped her.