Affiliation is to help you pay social security, and the company can deduct the disabled security fund. If you want to resign, the company will directly stop paying social security and give you a resignation certificate. This is issued by social security, and there is no certificate of resignation.
You can ask the company for a certificate of resignation. I have a copy, and the labor manual is stamped. If you can't get it, you can complain to the Disabled Persons' Federation and get it soon.