The XPS 13-9360 shipped with either of these WiFi. Check your invoice to be sure =
Intel Dual-Band Wireless 8265
Qualcomm Killer 1535 + BT
No, you were not scammed and it is doubtful that hardware would fail after simply doing an operating system reinstall.
You stated, "After a clean install of the OS (Windows 10), network adapter is not recognized at all.". That implies that the prior original Dell factory operating system image DID list the Qualcomm Killer 1535. Is that correct or not?
If correct, then the fault lies with your driver installation order. After the operating system is installed, each Chipset driver (11 of them) must be installed, one at a time, restarting the computer after each one.
Then install the Audio driver, restarting the computer when done.
Then install the Qualcomm Killer Wireless 1535 Driver, restarting the computer when done.
Then install the Killer Wireless-AC 1525/1535/1435 Bluetooth Driver, restarting the computer when done.