I contacted the feedback service on Turkish airlines website. I asked for a status match from AF-KLM FlyingBlue Gold to TK Elite (star alliance). I got a response in 12 hours, the customer service asked me to send a scanned copy of my passport, a screen of my AF-KLM FlyingBlue Gold membership card and my flight statements for the last 2 months with AF-KLM. 3 hours after my reply, I was raised up to TK Elite.