It does happened to me once before but I found a way to fix it myself
But I may not have your 100% answer, but here's what I think:
1. Someone tried to login your account and tried too many times of your password wrongy from other country (very high chances)
2. Your account maybe got hacked (if you always use same ID and PW in other games, high chances)
3. You maybe got the money from Gil sellers (random chances)
4. You maybe lying right now that you are innocence (I don't know :P)