Income tax refund deceased person

i have filed return of my father for AY 20-21 as legal heir. It has been revised again due to some data discrepancies. It was filed n revised on 13th feb 2021. It has been successfully e-verified. There is refund amount to be credited . But as of today, i didnt get any message wrt to refund.
How to change account details of
my father(deceased) which have been provided while filing?
can i provide my account details and how to do it ?