Final answer:
Apologizing, admitting the mistake, and assuring the customer that the situation will be quickly resolved is the appropriate course of action.
Step-by-step explanation:
Apologizing, admitting the mistake, and assuring the customer that the situation will be quickly resolved is indeed the appropriate course of action. This demonstrates good customer service and shows the customer that their concerns are being taken seriously. By acknowledging the mistake and providing a solution, the customer is more likely to have a positive perception of the business and be satisfied with the outcome.