Teacher not Submitted LoR

I asked for a recommendation letter and one of my teachers still hasn’t uploaded it. I emailed them once and they said they would finish it by the deadline(this was around 10 days ago) . However, I’ve emailed them for the past few days and haven’t heard anything from them.

What should I do with deadlines so close?

Stop pestering. Schools will likely accept a LoR a few days after the deadline. Check in when you go back to school.