1. From your description, I know two things that are good and bad for you.

A, it's good for you that you didn't go to school to defend your thesis and the school didn't ask you to go.

B, you haven't been to school for such a long time, and no one in school has asked or called to consult you.

The above two points are the fault of the school, and so are you.

Secondly, in the end, the teacher called you and said that your behavior was to drop out of school. I need to call you early to drop out of school, and I need to call you in advance to ask about your situation. The school doesn't have it. You can go directly to the school to deal with this matter based on these two points.

Then let them get your student status out.