Nexon have a couple of great games, which over the years I have spent a lot of time AND money on - all of which has now gone down the drain as my account was permanently banned for using 3rd party programs to cheat - - which is absolutely not true!
When I replied requesting that they investigate further and give me further information, they just kept ignoring what I said and repeated the same messages over and over.
This ban happened during a period of time where I had stopped playing for at least a couple of years - so I suspect that during that time Nexons database may have been breached and my account comprimised. Nexon did not provide any evidence, nor even much of a description of my 'violation' of their terms of service and ignored any requests for an investigation.
I have also read multiple other posts of people who have had the same thing happen to them - long time loyal players losing their accounts due to unfair banning - caused by whatever crappy detection software Nexon uses.