The 5G problem

I paid for a full year of OnStar; if my service on my 2014 Buick no longer works, and GM can't update the software, how can I get a refund; I still have several months left on the subscription.  From what I've read, the "dongle" is no solution.  I don't understand why GM can't fix this; all manufacturers have known for a long time that this would happen, and customers are being left in the lurch.