Schengen visa for Austria for me and my wife, the visa start date on his passport is a day after the date of arrival

I have received a Schengen visa in Austria for me and my wife from the Austrian Embassy in India. But the visa start date on his passport is a day later than the date of arrival, my visa being correct. VFS m asked to request a correction. How long will it take? I did not find anything online.

Instead of 22/03/19, she received 23/03/19. It is surely a mistake on their part as the details provided were accurate and I received the correct Visa card. VFS asked for an accompanying letter to indicate the correction.
Any help is appreciated. Thank you so much.