I have been having a similar problem.This problem has been reported already by the staff, they adviced us to wait till it's solved, read the pinned thread.
I can access and log in at "play game", but after loading up the actual game it gives the error 'incorrect username or password (5 failed attempts cause 15min ban)". On top of that, the 5 fail attempts ban isn't' even working. I have tried to log in, in game, around 10 more times and I haven't gotten the temporary ban.
I have tried changing my password, creating a new account, and reinstalling the game. None of these possible solutions have worked for me.