When I bought my GM truck last year, it came with OnStar. The saleswoman came to the part of the sale where she had to set up my OnStar account. I told the saleswoman that I would not consent to the OnStar trial service. When she tried to cancel it for me through their online portal, she asked for my email address, which was required to cancel the service. I refused to give it to her. She didn't know what to do because that portal was the only tool that she had to work with, and it required the information (she was professional the entire time, btw, as was I), so I told her that I would take care of it.
I walked out to my new truck (still in the sales lot), pressed the OnStar button, and the operator came on, asking me to set up my service. I told them that I wanted to cancel the service completely. What did they do? They asked for my personal information.
I had a back-and-forth with them for 10 minutes or so, with the operator telling me that they could not turn off OnStar unless I gave them my personally identifying information, and I kept telling them that they did not need that information at all and that I would not give it to them (they already knew my vehicle's ID... it's automatically included with the OnStar call).
When asked why I would cancel a "free" service period, I told them in no uncertain terms that I disliked the OnStar company, that I did not consent to sharing any private information with them, and I wanted the "demo" service (that was active when purchasing a new vehicle) disabled completely because I had purchased the vehicle. They kept telling me that they could not cancel the service unless I provided my personally identifying information.
I offered them an alternative. I told them that I could hang up, and the OnStar would stay in the unlimited "demo" mode where I would continue to get the service for free.
They put me on hold, and when they came back, I was told that their supervisor OK'd the cancellation without me giving them any personal information.
I should have just removed the antenna!