does anyone know the best way besides plane to do a border run from chiang mai. i was denied on the plane due to medical reasons even tho I have a note from a doctor saying it’s okay for me to travel so i need to find another way.

(UK passport holder) Is it possible to send someone else to cheangwattana immigration for me to get a 30 day extension on my SETV if I have a medical issue?

I have a back injury and have been to hospital. Currently 3 days overstay but the doctor has given me a letter to prove I have been incapable of getting there yet.

I could wait but would be nice to know if someone else can do it in this circumstance?

If someone is too ill to go to immigration what is the deal? Can someone go on their behalf? Email ? Do you need a doctors note? Asking for a friend.