The Niantic ban wave is coming. Many has been ban because of several reason. Mainly is due to using Pokemon Go bot and Pokemon sniping software. Another reason is because of using GPS spoofing software and using emulator such as Bluestack or Nox player.
How to know your account is really getting permanent ban?
1# Unable to Login to Account and gettig message “Unable to retrieve data from server”
This is the first sign of getting permanent ban on Pokemon Go account. However keep trying because somtime that is really the server issue. If still getiing the same result after restarting phone or clearing cache , that for sure the account is getting permanent ban!
2# Receiving the email from Niantic
Receiving the email from Niantic is 100% confirmation of getting permanent ban. However if really think that ban is a mistake, you can submit the ban appeal form.