Are there any kingdom halls of Jehovah's witnesses in turkey?

Yes. Go to the official website jw.org and scroll to bottom, click on "attend our meetings" and enter your location and language. It will tell you the nearest Kingdom Hall and language to your location.

Probably. You can write to PO Box 23, 34377 Feriköy, Istanbul Turkey and find out. (That is the address of the Turkish Branch office of Jehovah's Witnesses.