XPS 9560, motherboard failure, stranded without part

This is not what I expected from "Next Business Day" type of service... Is DELL deliberately slowing down service/support or running out of money or ... is my luck just bad or ....?

Dell people on here.. can you talk me down off the ledge?  I have loved dell for 10+ years and that is all i've ever bought both professionally and personally but at this point I'm starting to lose trust.

I have a 2 year old Dell XPS 9560.  In November the USB-C port stopped working. (6 weeks ago).

I was using the USBC port to drive a DisplayPort display... it stopped working.  I switched to using the HDMI port... and now that has stopped working also.  I can no longer get any external monitor to work with my XPS.  I have (of course) tested the monitor and cable with other computers and they are fine... and this setup used to work fine.

So: I called dell... and they said need new motherboard.. OK, no problem.  I understand... 

But now they don't have the motherboard and so.... keep pushing back the day of eventual repair/replace.  First the part was available (i forget exactly) 12/5... then 12/17.... and now 1/4.... and in the mean time I'm stuck.

Does anyone know what is going on w/ Dell and XPS motherboards?  Should we be escalating this as a group or am I the only one? (PS:  I know I'm not the only one since I know of at least one other XPS with essentially the same problem....)

thanks,