I did just cancel my account to World of warcraft in order to make a new 1 (other had some god damn payment issues wich weren't mine (don't bother saying "call blizzard cause i did")) So my question is, can i re-activate the account if i want to or?
It once got hacked when i was in Germany ... i didn't know about it, nor my friend until i came home
First off the majority of wow accounts aren't hacked at all but keylogged. Meaning there is a malicious software on your computer which can detect specific keystrokes and through doing that determine your email, wow, etc passwords.
Your account is often keylogged months before any changes actually occur to it (items stripped, gold taken, etc).
This is because keyloggers will accumulate thousands of accounts, and generally bulk sell them to a gold selling company and that company will then go through one by one and strip the accounts for currency.
So yes it's very possible to be out of the country, not playing, etc and your information is already comprmised without you knowing, then you come back and everythings gone.