I bought a dyson gen5 detect in July. It didn't work. I ran through the troubleshooting and contacted dyson through the chatline. I was told it was a problem with a head and they sent me a replacement. It still didn't work. Contacted customer service again, ran through troubleshooting again and was told that I needed a new main body and cyclone but it wasn't in stock. Fast forward to now (4 months later). I still do not have the replacement part. So 4 months after buying a brand new machine I  still can't use it. I phoned customer service this time and asked for either a full replacement or a refund and was met with a flat refusal. We can arrange a repair they told me. However, I am (understandably) fed up waiting for dyson to sort out my broken machine. I don't want a repair, I want a replacement machine or a full refund, after 4 months of waiting I don't feel my request is unreasonable.