Onstar Module Replacement ETA?

About 3 months. I finally got some time to call OnStar and was told I'm still under the trial period in which before this issue, i was impress the OnStar options I have on vehicle.  So, I sign in to website and elected to extend the period. According to the sales tech, once my trial period is over, I will have the option to cancel.  On 30 Dec, I stop by the Dealership GMC Legacy, Slidell LA to see what was the latest status. There still waiting for the part to come in. In meantime, my Onstar is not working and I believe there is hidden cost I'm currently paying for its services. My engine light remains on and I'm not sure what my next step will be. I always expected better of GMC in doing the right thing and hope this can be resolved soon. Family of GMC owners for decades. The dealership has been supportive and has made it clear they're waiting on the part. I don't know what my options are other than waiting at this point, but I am leaning more to contacting a friend of mine (Congressman). As a Retired Vet, I have patience, but 90 days plus is a bit much driving a 2023 Ultimate 1500 Series with the engine light on.  From my understanding, these parts are coming from a 3rd party which is currently back log.