When a customer is notified, he or she shall, orally or in writing, authorize, modify, or cancel the order for repair.
After cancellation of the repair order or a decision by the customer not to have repairs made after diagnostic work has been performed, the shop may charge for and the customer is obligated to pay the cost of repairs actually completed that were authorized by the written repair estimate as well as the cost of diagnostic work and teardown, the cost of parts and labor to replace items that were destroyed by teardown, and the cost to reassemble the component or the vehicle, provided the customer was notified of these possible costs in the written repair estimate or at the time the customer authorized the motor vehicle repair shop to reassemble the motor vehicle.
N.C. Gen. Stat. § 20-354.5