one extension for 30 days, all next entries - rejection with 7 days to leave the country. That's a standard stamp. It were simplified in reposts and reinterpretation. But it is one extension , all other tries will end with 7 day stamp go out. It can be also from first entry, if you came from land border.
only one issue in his message. It is a maximum one 30 days extension. It can be 0 also, if return same day or entered by land. But you can't now extend more than once for 30 days. They already decline if you try to extend second time this year. What you think is wrong here?