Mostly a south Indian festival, Vishu is the dawn of a new astronomical year, and the day marks the first day of the Malayalam month of Medam that corresponds with April in the Gregorian calendar.
They will issue a refund and depending on the method of refund, this should be completed within 28 days. You will be asked to return all documentation regarding the gap insurance you have cancelled and the cover will cease at this point.
You can go back three years from the original deadline of the tax return to get a full refund. After three years, you will not be able to obtain a refund. It is important if changes are needed on an already filed return that these changes are made within the three year time frame.