Vistara — Inconsiderate useless solutions instead of refunds

I had booked a flight ticket from Delhi to Lucknow for my mother-in-law for 3rd Feb. Due to a family emergency being my grandmother in law being in CCU, my mother-in-law had to leave for Lucknow on 30th Jan itself. I emailed Vistara on 30th Jan itself about the case and asked to provide credits/refund which can be used in the future. They wasted 30 Jan - 17 Feb by asking for numerous amounts of documents regarding proof of the patient and came up with the solution being date change which can be by my only my mother-in-law till 31 Mar 21. She cannot travel as Grandmother in law is still serious. Our case is highly genuine and as per their guideline, we were eligible for a waiver or at least a considerate decent solution.