And the short answer is deleted. It is your work permit, your Extension of Stay stamped inside your passport. It is therefor your responsibility to take care. And what ever people will tell you: It is not the responsibility of the teachers council, the Ministry of Education, the fishery department, the cashier of
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or who ever they want to tell you. You and only you, but if it is not done as it should be done you will face the consequences and that must be reason enough to take care.