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The fact that you paid with a credit card gives you a very good chance to win!
But most of us did not or the money-back-period has already expired.... :(

GM should offer a full refund to anyone that asks for it. Unfortunately, if offered and accepted, they wouldn't be able to operate as a company because most people would take them up on a full refund. Myself included. Also unfortunately, I should follow my own maxim: caveat emptor or buyer beware.