Use their feedback form at www.turkishairlines.com/en-int/any-questions/customer-relations/index.html
. Select "New Feedback" and then "Miles & Smiles" under "feedback category" and finally "Membership processes" under "Feedback subject,"
Need to submit a copy of your passport, statement of activities for the last 2 months, a copy of your card (both front and back). Electronic card, etc. from smartphone did not work.
You get 4 months Elite status (Star Alliance Gold), and if you fly internationally on Turkish Airlines within this period, the status will be extended further 8 months.
I got upgraded within 24 hours, which is pretty quick!!
on September 16, 2019