If you have no license at all, MIT or Apache license, you can ask GH to change the repo/take it down, if the user claims they made the software even if they did not.
However, you should make reasonable effort to contact the person and ask them nicely to change their text.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
If you have no license at all, MIT or Apache license, you can ask GH to change the repo/take it down, if the user claims they made the software even if they did not.
However, you should make reasonable effort to contact the person and ask them nicely to change their text.