This could be bad faith on dealer's part. The first thing you may want to do is contact GM. If they too refuse to help, get in touch with a consumer protection attorney.
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lemon law applies to new vehicles. If the dealership has rejected any requests for repair or replacement made in writing, then it may be time to contact a consumer law attorney. Take all the paperwork with you. You can also call the consumer office at the Dept. of Justice.
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