If you are hacking on an undetected hack and nobody reported you (eg you weren't visibly hacking) then you'll be fine.
If you were rage hacking you'll most likely be banned.
If you were using a detected hack then most likely nexon will catch up to you.
Here's a tip, use an UD hack, get to the rank desired and then wait a week to see if anything happens to your account.
If it doesn't then you are most likely clear, we wouldn't want you wasting money now would we?