What do you mean it flooded? If it was a flood that ruined your washer machine that's not a manufacturer warrantied issue. Most manufacturers have a 1 year warranty, if you purchased additional warranty then maybe.
I would go to the store with your receipt, and pictures on your phone. Ask them what the best options are, if it's not covered through Best buy it should be covered through the manufacturer.
Call home insurance company they should cover belongings if you have flood insurance
You should contact the store. And have your receipt.
I suggest you contact the manufacturer or brand directly.
Thanks! Your answer is awaiting moderation.