Bought a brand new soundbar Skyworth used it only 3days and its stops working im told 21days repair it cannot be replaced

Bought a brand new soundbar Skyworth used it only 3days and its stops working im told 21days repair it cannot be replaced. Terrible customer service at the gateway brand manager has no respect for his customers. I want a full refund he must repair a brand new soundbar and display it in his house.