They did not cross the border. It was a demonstration, and the IDF escalated it into an incursion. They have no credibility left. As far as going to the UN, what is the point. They never conform to criticisms against them and call the UN down as a useless body. So why should the useless body (the UN) even listen.
Merkel says refugee crisis as challenging as reunifying Germany (Reuters)
from the article: Israel to complain to UN over Syria incitement of border violence