I don't believe support can do anything - the only was someone will have access to your village is if they know your GC email and password. You need to think really hard about if you have ever given it out to someone.
Reconsider these options:
A) a family member plays on the iOS device without you knowing it
B) you gave your gamecenter password to a friend who used it to load your game
C) you gave your gamecenter password to one of those 3rd party gem sites
D) you logged onto a friends iOS device to play at one point, thinking logging out of gamecenter or deleting the app will prevent them from playing it (it doesn't)
E) you sold/traded/gave away an iOS device you had once played the game on without doing a factory reset and they still have access to your CoC village.
I know you said it isn't any but it 99% is one of them that you have done a long time ago. It will require a brainstorm for you to remember but it is your only option for now.





