What does being in Turkey have to do with being able to send it back (other than cost)?
1. Make sure the lens is completely mounted.
2. With the lens mounted, Hold down the lens release button and push the shutter release. You should hear the AF motor spin.
3. Make sure the camera is fully engaged in AF-S or AF-C with #4.
4. Check to see if the AF screw drive is protruding from the lens mount (lens off of the camera).
5. If this is a new outfit this shouldn't be needed but make sure the contacts on the lens and camera are clean.
6. With a small screw driver or similar, turn the AF screw on the lens to see if it is binding anywhere.
7. With the lens on or off of the camera (in Manual focus) turn the focus ring of the lens and make sure it isn't binding somewhere.
Good luck with it..