I was on about 70,000 energy so they may have picked up on that. Also you say that it's not a 100% ban so does that mean there's a possibility of actually getting my account back somehow?
Having a high amount of energy won't necessarily get you banned, though I have heard that having more than 600 energy AND not having spent real money on the game flags your account as a likely cheater. The flagged accounts are likely placed together during group events which then means that if one account is reported, all of the accounts are then checked manually.
As for the "100%" thing, if your account is banned it will stay banned unless it's overturned, which is practicaly unheard of. What I meant was that merely joining a full marks won't get you banned, it's only if there is report of cheating of anyone in the group that you will get checked.
I've got lucky, as all the groups I have joined have had low scores with no one cheating, so I have never been checked by JC for cheating. Also, I spent ~£10 on the game a while back which hopefully means my account avoided ever getting flagged, though I now only use the "unlimited energy" cheat rather than stockpilling energy after I heard abount accounts getting flagged.