@Gianni *****
Ah ok. You are not on a visa at all. You initially entered using a Non OA visa and have since got yearly extensions. To acquire those extensions you do indeed need “complementing” insurance because your entry initially was a Non OA.
However the re-entry permit that you have has no requirement for insurance. You have got a stamp that says you are allowed to stay until xxx date. When you leave and return with a valid re-entry permit you will be stamped in until xxx date, you do not need to show insurance for that. It’s only at the time of your next extension that you need to show insurance.
To get off the “gravy train” of needing insurance you’d need to exit without a re-entry permit thus nullifying your current extension status and re-enter on a Non O visa or a tourist visa or exempt entry and apply for the Non O in country.