Billed for Onstar in a rental car?

I rented a Chevy Captiva last week. I absolutely hated it for a number of reasons, but among them are the controls. My sister hit the Onstar emergency button while fumbling in the dark for the map light switches, and it apparently made a cell phone call and an operator started talking to us. We managed to hang it up quickly, but then started to make two more calls to the regular Onstar only to get them hung up quickly before we figured out the unlabled LED next to them meant “system enabled”, not “call in process”. So am I going to get backbilled for this? I’m imaging a couple of $25.00 service charges plus whatever the actual service cost…

The only ones who could possibly answer this is the rental company. We don’t know the name of the company or the contents of your contract.