Someone is impersonating me but i dont have required information to make a form


OK here is the thing. There is a person on twitter who is impersonating my youtube account name and also linking to my youtube account. The person have wrote offensive and spam tweets to people im subscribed. I would like to get the username for personal use after he got his butt suspended. I tried filling a complaint about impersonating, but i need to send a lot of things to twitter which i dont have since my account is not really a trademark. Im pretty sure its against the rules to directly link to my youtube channel without my permission, when its not a fan or made to support me.