Bad customer after sales service

I purchased a Polk soundbar from House and Home in October 2023 which I returned to them as it was faulty. They sent it to the supplier who then passed a credit to House and Home. The salesperson called me to come into the store and take a new soundbar. I when to the store and informed them they don't stock the soundbar I was wanting and requested them to credit my debit card. The manager informed me that they cannot refund me which I totally disagree too as the Polk had credited House and Home for the faulty soundbar.