Used feedback form on Turkish airlines website, asked to send a copy of an id, a copy of Etihad gold card and last two months flight statements.
after two weeks I got this in my email:
Elite Status Match was done as per your request in your feedback, and your membership account number TK438323264 has been shifted to the Elite status. The Elite card trial period is 4 months. Subsequent to the inclusion of an international flight you will perform with Turkish Airlines within the first 4 months following the beginning of your Elite membership in your account, your trial period will be extended for 8 months and regarded valid for one year in total. If you earn 15,000 status miles in Turkish Airlines international line flights in the first year of your Elite membership, your membership will be extended for one year, and it will be valid for two years in total. If the first flight you will perform within the trial period is Business class, you will earn 50% more status miles.