Best Buy review: computer charging cord

After purchasing a Microsoft laptop for $999 2 months ago, the cord that came with the computer failed to charge the computer. Taking it back with the receipt, my mother was forced to pay $67.99 for a new cord. I felt that since this was a defective item that should have been covered under a warranty, so why did she get charged for a new one? I request reimbursement and an apology.