Faulty OnStar module

I am too another unsatisfied customer.  I renewed my subscription back in December after my initial subscription ended.  I rarely use it but have it just in case I needed it.  Apparently, my module went out on me a while ago and I did not notice it until I tried to use the app to start my truck and it continue to fail.  So, I just figured that it was because I haven't cranked it for a few weeks.   After during some investigation on why I was continuing to have that issues I noticed that the information like my tire pressure, gas amount, and oil life was totally different on the app from the gauges on my truck.  So of course, I googled it to find out why I was having this issue and found out that the Onstar wasn't properly working.  So, I called Onstar support for assistance to get this matter taken care of.  They tried to make a connection but could not and they then asked me if the light next to the Onstar button was green and I told them there wasn't any light.  They informed me my module wasn't working and that I need to take it to my dealership to get a diagnostic, so I called the dealership to asked what the price was and how long does it take for one.  They told me that the cost was about $212 and that I will have to leave my truck with them for 24 to 48 hours.  So. I am supposed to be without a vehicle for a possibility of 2 days?  I think not!!!  I was also informed that depending on the type of module that I have it could take several months to get it replaced because of the back orders and the cost of replacing it could be upward of $1200.  So, I started to do some researching and see that this is a recurring problem with customers for a couple of years now.  If this is a continue issue, then why haven't GMC done anything to resolve this because apparently there is an issue with defective modules.  I can see if these modules were used on a daily basis, but most probably are not (base on my experience and usage) that the customer (vehicle owner) should be responsible for it but majority of them are only there if needed.  So, my question to GMC is since my subscription is over 30 days and the back orders for modules are upward of several months, can I still get a partial refund? Starting from the time the module stopped working!