Abraham did "NOT" disobey God nor did he disobey the angel of the Lord. Let's look at the context starting at Genesis 22:1. "God tested Abraham and (He God) said to him, "Abraham!" Vs2, "Take now your son, your only son, (Abraham had Ishmael before Isaac) to the land of Moriah; and offer him there as a burnt offering."
So at vs3 Abraham obeys God and at vs9, Abraham arrived at the place that God told him. At vs10, "And Abraham stretched out his hand, and took the knife to slay his son."
Vs11, "But the angel of the Lord called to him from heaven, and said, "Abraham, Abraham!" And he said, "Here I am." Vs12, And he said, "Do not stretch out your hand against the lad, and do nothing to him; for now I know that you fear God, since you have not withheld your son, your only son, from Me."
At vs13-14 God provides Abraham with a ram, and offered him up in the place of his son. Abraham called that place, "The Lord Will Provide.
Vs15, "The the angel of the Lord called to Abraham a second time from heaven. Vs16, and said, "By Myself I have sworn declares the Lord, because you have not withheld your son, your only son, vs17, indeed I will greatly multiply your seed as the stars of the heavens, and as the sand which is on the seashore; and your seed shall possess the gate of their enemies. Vs18, "And in your seed all the nations of the earth shall be blessed, BECAUSE YOU HAVE OBEYED MY VOICE."
The first thing I want to address is the fact you cannot "assume" the angel of the Lord is an actual angel like Michael or Gabriel. The Hebrew word for angel is "malak and it means "messenger." The "context" determines how it is used.
At Malachi 3:1, "Behold, I am going to send My "malak/angel/messenger," and he will clear the way before Me. And the Lord, whom you seek, will suddenly come to His temple; and the "malak/angel/messenger" of the covenant, in whom you delight, behold, He is coming," says the Lord of hosts."
The "malak/angel/messenger" who will clear the way of the Lord is John the Baptist. This is clearly confirmed at Mark 1:1-3. So John is a human with a message about the one coming to His temple.
Also, the Prophet, "Malachi" is human and his name comes from the Hebrew word, "malak." Another thing of note is why does God have the angel of the Lord call out of heaven two times? God Himself called out heaven at Exodus 20:22 and in the New Testament at Mark 1:11.
Another question that is raised is from Genesis 22:12 where it says, "Do not stretch out your hand against the lad, and do nothing to him, FOR NOW I KNOW YOU FEAR GOD etc. The angel of the Lord is doing the speaking and it's not unusual for God to speak in the third person. Genesis 19:24, Exodus 34:5-7 and Job 1:8, "And the Lord said to Satan, Have you considered My servant Job? For there is no one like him on the earth, a blameless and upright man, fearing God and turning away from evil."
I am convinced that the angel of the Lord is the pre-incarnate Jesus Christ. And I'm not the only one who believes this. Just google, "Who is the angel of the Lord."
But what evidence proves this? The Jews have what is known as the "Shaliach" principle. This means that an "agent" acts on behalf of a principal. In this case the angel of the Lord is acting on behalf of God. This principle will not work for the angel of the Lord if you first "assume" that the angel of the Lord is just that, an actual angel.
At Genesis 17:1-2, "Now when Abram was ninety-nine years old, the Lord appeared to Abram and said to him, "I am God Almighty; Walk before Me, and be blameless. vs2, "An I will establish My covenant between Me and you, And I will multiply you exceedingly." In this chapter the Lord God appeared "physically" to Abram. This is confirmed at Genesis 17:22.
Here is what Hebrews 6:13-16 states referring back to Genesis 22. "For when God made the promise to Abraham, since He could not swear by no one greater, HE SWORE BY HIMSELF, vs14, saying, I will surely bless you, and I will surely multiply you." vs15, And thus, having patiently waited, he obtained the promise. Vs16, For men swear by one greater than themselves, and with them an oath given as confirmation is an end of every dispute."
Even in normal court dealings today if you saw a crime you can't send someone else in your place to swear for you. In fact, even if one cannot make it to court for some reason the court will send someone to you and they will "depose" or take your deposition.
The bottom line in all of this is the fact that an actual angel cannot swear an oath on behalf of God Himself. God the Father has no separate manifestation from the Son. The Son is the only manifestation and revelation of the Father. What is known of the Father is revealed through the Son. To see the Son is to see the essence of the Father. (John 1:1, 18; 10:30; 12:45; Colossians 1:15; Hebrews 1:3.
It may surprise you to know that at Revelation 10:5-6 an angel swore his oath in the name of the One who lives for ever and ever, the Creator of everything in the universe, that is, in the name of God and the Lamb.