Dyson Purifier Hot+Cool Autoreact Replacement Problem

I Bought a Dyson Purifier Hot+Cool Autoreact. Soon after, an exclamation mark appeared on the digital display. We contacted support over the phone and followed their instructions, but the exclamation mark didn't go away. When we called the support line again, they told us to have the product checked and to hand it over to the shipping company sent by Dyson service. We packed the product and sent it to Dyson service. The representative who called from Dyson informed me that the product was defective and would be replaced with a new one. However, they mentioned that they couldn't provide a replacement at the moment because it's out of stock in their service inventory. They said we could pay the amount equivalent to the product's value on the day we purchased it (7500 TL) or the current value (17,500 TL) if we wished. Additionally, since there was no stock at the service center, they returned the product to us and asked us to keep track of their inventory and notify them when the product arrives so that they can collect the faulty one and send a new one. When I checked Dyson's website, it showed the product as available in stock. However, Dyson service claimed that it wasn't related to them and stated that their inventory and the website stock were different. I couldn't understand how and where to track the product's stock. Moreover, why should a customer be responsible for tracking stock for a faulty product? That's the company's job. I have purchased electronic goods from various brands, but I have never encountered such behavior. If a product is defective, it should be directly replaced. If the product is no longer available for sale, it should be replaced with a new model by paying the price difference. It is not the customer's responsibility to track stock. The company should do it for customer satisfaction. As soon as stock is available, it should be shipped to customers in order without causing any inconvenience. Faulty or defective products should not be sent back to the customer. If you are a global brand, you cannot disappoint your customers. When I researched the product online, I discovered that Dyson's support line had treated others the same way they treated me. The purpose of this message is to find out if Dyson UK or Dyson Turkey knows about the deficiencies in their sales or after-sales support. Are they checking? Or are they aware of these issues and turning a blind eye? I want to know before resorting to legal action in order to assert our rights. Kind regards, Pinar Kamaci Dinc