What did the devil do wrong?

Satan the Devil is the foremost slanderer of Jehovah God. Satan is described as the original serpent, evidently because of his using a serpent in Eden to deceive Eve, and for this reason “serpent” came to signify “deceiver.” The one who became Satan was originally a perfect spirit son of God. When saying that the Devil “did not stand fast in the truth,” Jesus indicated that at one time that one was “in the truth.” (John 8:44) He abused his freedom of choice, allowed feelings of self-importance to develop in his heart, began to crave worship that belonged only to God, and so enticed Adam and Eve to listen to him rather than obey God. Thus by his course of action he made himself Satan, which means “adversary.”

He is the one who has caused all the calamities on this earth. One example out of many is Job. We read in the book of Job chapter 1 that Satan caused a windstorm to kill all of Job's 10 children. After that, it was one catastrophy after another including painful boils on Job's skin.

1 John 5:19, "We know that we originate with God, but the whole world is lying in the power of the wicked one."

Psalm 37:10,11 mentions that soon the wicked will be no longer. "Just a little while longer, and the wicked will be no more; You will look at where they were, And they will not be there.  But the meek will possess the earth, And they will find exquisite delight in the abundance of peace."

(New World Translation of the Holy Scriptures.)