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Learn how to use the features on your vehicle and troubleshoot common issues. Gm) announced today plans to invest more than $100 million in its customer care and. Please share your questions and comments with us. — general motors customer care and aftersales has taken the next step in its global rebranding initiative. Web contact gmc today via phone, email, chat or mail. Get help for your buick. Gm) announced today plans to invest $23 million in its customer care and. Web contact our support staff at general motors if you are not enjoying an exceptional experience and let us help you with your.