"Login Failed after 168h Ban – Account works on other device"

You do understand that using a cheat, even in so-called "offline" events, is still cheating—plain and simple.

Uninstall the game, clear your cache, and perform a deep clean of your phone before reinstalling. If that doesn’t work, consider a factory reset and try again. Hopefully, this serves as a lesson—cheating isn’t acceptable. If you can’t get the game working again, that’s the consequence of your actions.