Not only using engine is baneable, cheating in anyway is baneable too, like sandbagging. I have seen a lot of people sandbag, and you are one of those sandbaggers. Losing every tournament game except in the 10 mins tournaments, in which most of those games you do not even move.
I hope they do not unban your id. Make a new id and play correctly without trying to deceive rating and cheating. Although you will not get your cubits nor crowns back that you win after sandbagging.