Xiaomi Smart Air Purifier 4 - Filter Supply Issue

I bought the Xiaomi Smart Air Purifier 4 last year, but now I have a big problem: I can't find any replacement filters anywhere. It's very annoying and seems like a complete rip-off. When I bought this product from Media Markt, they said we wouldn't have any trouble with spare parts. But that's not even close to the truth. If you're thinking about buying this item, you should think twice. It looks like you can only use it well for about a year. After that, you might be stuck with a device that doesn't work. Because of this, I don't trust Xiaomi or Media Markt as much as I used to. Buyers, watch out!