Playing on mobile (android) can be very dangerous, as some active apps may be detected as cheating programs (especially if rooted). But as far as I know (and I don't know much about this game fool-play detection system), a staff member had to keep an eye on you before proceeding to ban.
Anyways, as stated above, the right thing to do now is to make an appeal in the appeals section, that way staff members can revise your case.