I understand your frustration, I felt the same way.
I was able to stop the issue from happening by removing the contact, and re-adding them. I did this all through the web interface on a pc. It was much easier that way.
You need to did it via the contacts interface through a web browser. Just delete the contact that gets duplicated, and re-add them. Its not the best solution, but after doing that, I have not duplicate contacts again. It only seems to be an issue with old
contacts, who were messenger contacts as well. I have not seen the issue with new contacts at all.
Hope it helps!
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