Dempava, I just asked this question on another forum. When we registered on 27th Jan the lady in the SGK office said they would write to us in Feb, not received anything yet.
The person who answered my query said they had been back to SGK to check if they had been accepted, were told yes, go to Ziraat Bank and pay. Apparently they don't give you anything paperwork wise or a ref number, you use your Kimlik number.
We plan to call into the SGK ourselves shortly and see if this is correct. As suggested chaos as usual. No info, no instructions, no organisation - just deadlines !!