If you used this ESP hack, chances are you were using a profile hack as well, which is more than likely what resulted in your ban...
If you are prestige level 3, character level 50, there's a good chance a whole bunch of jealous rat players decided to flag your account for cheating. What happend was, Behavior went and looked at your stats and they didn't match up. I don't think this cheat is actually detectable by their system while you're not using it... I think it was mostly just a stats comparisons that got everyone banned.
I myself was banned but I repurchased the game on an alternate account, I wasn't using this ESP hack as the killer, just as a survivor but now considering how annoyed I am with how the developers are handling this game (nerfing survivors, treating their customers like total **** by deleting posts off of the forum / banning people) I mostly play as the killer now and no one gets out alive.
The game is practically dead any way, apparently 400K people bought it but at it's peak only a measly 24K people were playing it. At the moment there's only around 9K people playing on average with 16K at it's peak. Considering there were probably thousands of people who got banned for cheating and a lot of people who aren't happy with the survivor nerfs, I can't see this game lasting much longer any way...
This game was made for twitch users to make a quick buck and get a whole bunch of free advertising exposure, basically just breeding a whole new generation of degenerates like PewDiePie. It's obviously working if 400K people bought this pile of **** but 95% of them aren't even playing it.