1. It turns out that the answer of state-owned enterprises is correct, because you have the receipt, which means that you didn't transfer the letter from the school to the enterprise, so your relationship lies in the school.
Solution:
1. Go back to school, find the office that gave you a letter of introduction for the last time, explain the situation and admit your mistake, because according to the regulations, if you don't pay membership dues for more than half a year, you will automatically quit the party. Generally speaking, they will help, after all, they are graduates of their school.
Find the stub of the letter opened by the school party Committee at that time and give them the letter in your hand. The original stub is invalid. You can open a new stub.
If you don't understand, you can directly dial 1237 1, which is a newly opened national party member consulting service dedicated telephone. You can call anywhere, but you must make a big noise, because the responsibility lies with you.