If it has been that long without resolution, file an issue with your credit card provider.  
I order an XPS on Dec 1st 2020. FedEx was unable to deliver the package although I called Dell to correct an error on the shipping address after the 1st attempt on the 3rd. The computer was returned to Dell by FedEx on Dec 9th. Dell was unable to reship the computer (I don't know why).  I've been calling customer service and chatting with reps via Facebook for a month and can't seem to get a refund.  I've been told 10 to 14 business days or 3 to 5 business days several times.  Hopefully reaching out here will help.  I'm not sure what else I can do...
Can't get a refund