Onstar Module Replacement ETA?

I’ve been driving Yukons for over 10 years, and my 2023 Yukon, purchased new, started to lose time on the onboard clock, not display the speed limit, and not connect to the MyGMC app 8 months ago.  I discussed all these issues with the dealer’s service department during 3 separate service visits and was told that perhaps the system would re-set itself.  After having the Serial Data Gateway Module recall completed, and told again that perhaps that would address the various problems, which it did not, I finally called the 1800 number in the GMC app.  They diagnosed that my Onstar system was not working and was offline for 8 months and at the time the car had 19k miles and the dealer needed to check the problem.  The dealer found the Onstar Module was not working and needs to be replaced.  The part is on a national back order with no ETA.  Very disappointing to have a wide spread problem that apparently isn’t part of any check list or isn’t easily diagnosed.  Then having the part not available and not communicating resolution timing is completely unacceptable.  It is fortunate that I made the call and figured out the problem 4k miles before the warranty ran out - although perhaps that was the plan all along - avoid detection and maintain back orders until warranties expire.  For a $75k automobile, I expect higher quality service and response.  It is also awful that Onstar has not delivered service to me for a third of the time that I have contracted with them.