No care for customers and no back up spares for items purchases

I ordered 2 carbon filters for a Philips air purifier from their online store on the 30th of April. They had supp**** the original unit and now I need the replacement filters. The payment was deducted immediately from my debit card, and the site stated the items were in stock. It stated that delivery would take 7 to 10 days - after 2 weeks I was advised they did not have the items in stock and could I please apply for a refund. Due to their poor system management I must apply for a refund, it should have been automatic and with an apology!! this was frustrating in itself but since applying for the refund I have had many further frustrations. It was taken so long and I still don't have the money back yet. 5 weeks and still waiting. I will never recommend this company.