[Roughwater]

This happened to me as well. I found out while driving in an area with no cell service and trying to use my OnStar when I received the "You have 0 units remaining." After multiple attempts at trying to get them to track the usage and hearing the we don't have any info about usage for calls I was transferred and told I would have to explain my situation and they might credit me. As soon as the woman picked up that I was transferred to she instantly credited me my 100 minutes back.

With the exception of the last lady I spoke with, the OnStar reps were terrible. I had one who spent 15 minutes trying to give me a fax number for them even after I explained I was doing 80 down the highway and wouldn't be writing or faxing anything to them at that point in time.