Tell GreyStone you will not deliver a message to your son unless they pay you $500 in advance. Don't hold your breath waiting for the money, but maybe they will stop calling you about your son's debt.
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Send them a certified letter telling them that your son does not live with you and to stop contacting you. if they continue to contact you after that, document it and go see your local attorney about suing them for violating Oklahoma's Consumer Protection Act.
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