I try. You're visa is stamped used and became invalid on your day of entry. You got a new stamp Admitted to Stay with mention your day of arrival and the Admitted to Stay
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/2019. You can apply at most Immigration Offices for a 30 day Extension of Stay between 30 days and the last day mentioned as Admitted to Stay (your case
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/2019). The 30 day Extension of Stay is added on
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/2019, with some calculation this will be 28 March 2019.