Why would a guy keep touching me when I've said no? He also keeps trying to hangout with me?

I've clearly indicated to him that I don't want him to touch me but he still keeps trying to touch me. I've also told him to leave but he still keeps trying to hangout with me. I have no choice but to be around him for professional reasons else there wouldn't be any problem in the first place.

What should I do?

Why would a guy keep touching me when I've said no? He also keeps trying to hangout with me?
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