It is possible about the same email address. I guess DMM maybe compare the black list within IP, IMEI, email adress and nickname, etc. so they find you to suspend again.
Some players have complain and report with screen capture to DMM via email or social network as Twet, FB, Discord, etc for abnormal damage value.
And high possibility, DMM will patrol all player's screen at variable time frequently for suspect player.
I am suggest that suspended player forgot this game or install an original APK file to play again. A lot of mobile game in the world can be play. It is not worth to unpleasant for the game.