So after further investigations and trying several things. I found out that they are using some kind of anti-cheat system. I contacted support and my doubts come true; they really are using anti-cheats and combat system verifications.
“After thoroughly checking the issue, we’ve confirmed that...
Rooting isn’t the problem, coz I got banned on multiple accounts (ones I rerolled and never played) and I’m not rooted. Guess they are checking the progress that are almost impossible to achieve in a day or 2 like the last level in exp dungeon. I will do more checks and give a summary later on.