Contended with God's angel is effectually contending with God's authority. God isn't an angel though nor the angel of the Lord. I see you know absolutely nothing about agency.
Scripture teaches the angel of the Lord is not the Lord. They are speaking to one another and it should be clear to any rational person that God isn't His own messenger.
Zechariah
12Then the angel of the Lord said, ‘O Lord of hosts, how long will you have no mercy on Jerusalem and the cities of Judah, against which you have been angry these seventy years?’
13And
the Lord answered gracious and comforting words to the angel who talked with me.