All of this alts and getting banned doesn't matter as ban is personal and if the operator of the account was not the OP at the time of this it doesn't apply to him and hence he can recover his account. Your connections would be valid only if they are from before August 2018, before the password change.

About the email thing, OP could be unaware of what all was changed as he doesn't know much about it.

By paying attention at the merit history, you can easily track up the hacker, and he is surely not from Canada as per his posting style and him posting in Shri Lankan thread.