Send a text message to the doctor asking if the call time has not returned.

First, maybe your words are impolite, and you always feel that you don't respect people, so you don't reply. Second, it may be a trivial matter for your teacher to send a text message for help, or it is not within his scope, so he won't reply to your message. Third, the teacher doesn't know who you are at all, or the teacher doesn't have the habit of reading short messages. If you are in a hurry, you can go to the teacher.