make a sentence impressive

[shasha1]

Dear Teacher,

there are some subordinates who go to leave without completing their files correction work (a daily task which is assisgned to them) so i want to send them an email like that:

"I am getting compalins from users about files correction so before going on leave please complete your files correction work"

my queation is how can i make this sentense impressive to send all of them? should i more lines?

Thanks

[Mister Micawber]

"I am getting complaints from users about files correction, so before going on leave please complete your files correction work. I understand that this daily task is not a pleasant one, but it is critical to our business that it is completed in a timely fashion. Please be sure that you have done so."