Complaint Review: Onstar

I cancelled my service in May 2017 and was told at that time it would be no problem also was told I could continue to finish out my subscription through June 10th 2017. June 10th arrived and I found out that I was charged again in June for another month.. When I called this time, OnStar cancelled my subscription immediately and then told me they could not refund me?? WTF???.. Will never activate their service again and may just stop buying GM vehicles altogether... They seem like they are a good service at first but after this billing bs I will most definitely not recommend this company to anyone..