Customer Satisfaction in Online Shopping at Beymen

I bought a dress from Beymen.com, but unfortunately, they couldn't provide the product because they sold an item that was out of stock. In return for this, they informed me via email that they had provided a discount code for customer satisfaction. I used the discount code they provided to place an order for another dress, but the size didn't fit. I requested a return for the order and contacted customer service. Customer service informed me that the discount code couldn't be reissued and that it was a one-time use code. Despite my explanation that I would return the item that didn't fit and make a size exchange, they didn't assist me. Such a situation can disappoint your customers and erode their trust. I can understand that the discount code is for one-time use, but the lack of attention to resolving the issue and the response from customer service further bothered me. I request the resolution of this matter and the refund of the code. Additionally, I recommend that customer service works more swiftly and effectively.