Final answer:
Politely explain to the customer the terms of the promotion and that no additional discounts can be offered. If necessary, involve a supervisor or manager. Throughout the interaction, maintain a friendly demeanor and provide excellent customer service.
Step-by-step explanation:
When a customer insists on a discount during a promotional period where no additional discounts are being offered, it's important to approach the situation with professionalism and clarity. Firstly, you should politely explain to the customer the terms of the ongoing promotion and that additional discounts are not part of the offer. If the customer continues to insist, you can assert the store policies calmly and ensure them that the existing promotion offers the best value at the moment.
If the situation escalates, it may be necessary to involve a supervisor or manager to further address the customer's concerns. Throughout the interaction, maintain a friendly demeanor and provide excellent customer service to leave a positive impression even if the request cannot be accommodated.