And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man [child]. Revelation 12:13
A number of events occur in Revelation chapter twelve. The dramatic fall of Satan to the earth is one of them. It marks the beginning of the Great Tribulation.
An amazing fact is that Satan and one third of the angels in heaven are cast out. They do not come out of a trapdoor in the ground and smelling like sulfur. Until that day, Satan and these angels are heaven dwellers. Not the third heaven where God dwells, but the second heaven, the starry sky.
Michael and his heavenly army will do the job when it is time. This is further illustrated in Revelation 12:7-8.
How can anyone say that Satan is not in hell? He is no more in hell than Santa Claus is at the North Pole, and chapter 12 of Revelation proves this.
Riddle: What is the difference between hell and the North Pole?
Answer: The North Pole exists.
I looked up the word "cast" in Strong's concordance. It is a very good study in itself.
I ramble, but please let us get free of mythology in Bible interpretation. It may take awhile, but if you are patient it is really not hard to do.