OnStar Promise to delete credit card information from their system but keep Billling months after account has been cancelled. Internet

I would never use this company again. 2 months ago i purchased a vehicle that is not On Star capable. I called to discontinue the service and was told that my credit card and Bank info would be permanently removed from their system, well guess what? The very next month i was billed again but when i called this time i had to "squint" to understand the person that was on the phone. I asked where my call ended up and i was told the Philippines. That upset me a lot as i do not like giving my money to companies that outsource. Sorry i am American and spend my money on American products. Anyway, they sent me a check in the mail and the almost non English speaking CSR apologized over and over again and i thought that i would never have to hear from On Star again right? Wrong!!! While checking my Bank account online today one month later i saw that On Star had charged me again. I called and of course got the non English speaking CSR again who apologized over and over and then had to transfer me to a Female CSR who i understood as little as the first person. She tried to tell me that i had been charged a prorated fee for August 1 thru August 9th. After numerous attempts of trying to make the CSR understand that i cancelled my service in June almost two months ago i asked if i could be transferred to someone in America. I was put on hold for about 5 mins. and got someone i could understand but was very condescending and almost rude. She did however promise to send me a check for the money that was taken from my account and promised me for the third time that On Star would not charge my account again. Well let's see what happens next month>