2017 Chevy Express discontinued parts

I need help finding the following 2 parts for my 2017 Chevy Express 2500 van. GM has discontinued the ebcm (electronic brake control module) & wiring harness and my vehicle is inoperable & unrepairable at this time. It has only 63k miles, mint condition. GM will not do anything to help rectify this situation. I have checked EVERY online parts place that I could find and thought was reputable & nothing no parts. I have started checking junkyars so far nothing. I have asked mechanics if this can be by passed and have been told no. I am NOT a mechanic and do not know what else to do. I have filed a complaint with the Federal Trade Commission and so far have not heard back.