I Need Help

I ordered an air purifier for medical reasons. Dyson sent incorrect tracking information and the item never arrived. I found out they sent it with GLS who, after speaking with GLS, broke policy when they left the item at the front door. There was a signature required and no one signed. So the item was stolen, we assume, probably by the GLS driver who blatantly lied about the delivery time. Customer service is telling me they will file a claim with GLS and I will have to wait 30 days for a resolution. Meanwhile Dyson keeps my 500 bucks and I have no machine. I have never had a company hold onto my money like that without sending a replacement. The supervisor I asked to speak with told me there was nothing he could and hung up on me when I kept trying to ask questions. If someone from Dyson doesn’t contact me with a resolution fast they will never get my money again. I have spent 1000s of dollars on hair equipment, vacuums, and now an air purifier. This is the worst customer service I have ever had with them.