Perhaps it was the store that was dealing with the matter ( I assume you went back there!).
In my location and within a 4 mile radius, we have 3 stores and a new one being built. All the 3 stores seem to replace faulty items if they have stock available. If you look in the store, you may find a trolley with returns waiting for disposal.Regarding 'no stock', then the store managers usually deal with the matter,and make arrangements at your request and approval.
I had cause to take an electric disk grinder back, that had failed after about four months. The store manager gave me an immediate full refund in cash even though I had paid by debit card, no questions asked or fuss made.