Contact GGG at:
If your Path of Exile account been banned, write an email to GGG directly: email@example.com. Their team is currently working through a large influx of inquiries. Normally, it will take a few days for a response once they’ve been forwarded on.
Players can create multiple accounts and even have more than one logged in at a time.
Path of Exile(GGG) does not allow anyone to buy PoE currency with real money. Buy currency is not 100% safe. However, this does not mean your account will be banned if you have bought currency items.
RMT in online gaming is like a double-edged sword. It has its benefits but there are also some downsides to it. Just be careful who you decide to trade with.