I apologize for making you frustrated with the company's products; We will refund to you, and I apologize to you again that the item has an error, hope you used.
Sorry for making you frustrated with the company. We will refund you and apologize once again that the product is faulty. Hope you will use the new service.
Sorry for making you disappointed with the products of our company. We will give you a refund and apologize to you again, product error. I hope you will come again.