I signed a few years ago, so what I signed for in Lira is largely irrelevant as the inflation has been insane.
In terms of real use in the real world, my salary has declined approximately $1000 a month. That is when our adjusted yearly increment is applied twice a year, so it can be more of a loss as the months pass until the adjusted inflation rate. The increases are not keeping up with inflation, thus slowly earning less.
The accommodation allowance has remained the same for 6 years, so the purchasing power is far far less than it used to be.
When I joined US$1 = 1.4 Lira, Now its more like 2.7
If you signed for 18000 TL and now getting 21000 TL basic,you did get a pay RISE,if the LIRA is going to hell,you still got a pay rise in TL!
They are advertising a pay RISE in TL not in USD or EUR or whatever currency you use at home.