Well if the agencies were advertising a salary that was 6 years old,you would understand the Airline wants to update its terms since the last one no?
If they were still advertising 18000 TL basic and now pilots are making more because of internal salary increase,(some inflation adjustment )I get it why they told the agencies to update the offered pay.
If the 20 % is not correct then the agency should have caught it since they know the difference between the last and new pay.
Now they may have turned a blind eye to get more CV in...but in any case as long as THY didnt tell you that they will rise your salary as direct employee by 20% by next month and then dont,i dont see the problem.
Pilots who join now have the "new contract term" which is your actual terms as a current employee.
No?