I had a similar experience with Microsoft initially closing my incident without contacting me about the incident, then got it opened again, they then said they were dispatching an upgraded version but later got cancelled because they don’t have any!!!!!! Microsoft doesn’t have any of their own webcams!!! Shocking!
Eventually got Microsoft store credits for the price I paid for it but didn’t require the serial number but just the invoice. Hope you get your refund if you have the invoice.