Arrogant manager

I sent my son to go buy a Lancewood cheddar cheese that was on special over the weekend, only to find that, the one that I wanted was not on special. When I tried to return it I was advised that non-perishable products are not returnable, of which there is no signage that states such. I then advised the manager that the cheese has expired he told me there is nothing he can do the best before date is 21-04-2022 he said I took and that's that. He even went as far as allowing me to take a picture of him. That's how arrogant he was. He was not willing to satisfy me as a customer. He said I am welcome to Jump off the nearest cliff for all he cares