I have good news for you, pilgrim.
Permanent residency is permanent. it does not have to be renewed. You only have to be sure to set foot on Argentine soil once every two years, even if you got back on a plane and left the same day. You should never have to return to migraciones. Your DNI will be good for about fifteen years. and you will be able to renew it at an office of the Registro, not migraciones.
You do not have to wait five years to apply for citizenship. There is a two year "residency" requirement, but your "residency" (for citizenship purposes) may have started the first day you set foot on Argentine soil.
The five year waiting period was based on an "obsolete" requirement of three years of temporary residency followed by two years of permanent residency, but as long as you have permanent residency there really isn't any pressure for you to become a citizen.
Well, at least not yet.
PS: As soon as you have your DNI you can go to the federal court that has jurisdiction where you are living and ask when they'll accept your application for citizenship to start the process and what documentation is required.