i need suggestion from the seniors and especially govt employess about applying through proper channel.

as i applied for Assistant air traffic controller a month ago in a hurry. when i applied time was short so considering the lengthy official process i didnt applied through proper channel but i mentioned in my application form that i am doing a govt job.

so now i have received interview letter and when i wil appear before the panel atleast they will ask me about the permission certificate.

now whether i should get a dptmental permission certificate or i should appear without it. since i have been doing this job for three years.

plz suggest me quickly