From what I've seen on other threads on the Boards, your account may have been suspended for one of these reasons:
- Your account has been compromised, and Player Support has placed an indefinite lock until the account owner can claim the account back.
- Your account has been involved with MMR Boosting.
- Your account has been involved with the use of unauthorised third-party applications.
There could be more reasons, such as behavioural manual reviews, but the Player Support ticket that you submitted is the best place to go. Generally with permanent suspensions, they cannot be reversed unless the suspension was issued in error.