eBay

I paid for the product, then the seller writes that the product is not new, he can return the money, or send the product and return $ 13. I agreed with the purchase of the product and the return of $ 13. I received the goods. On a request to return $...

In general, the seller made a discount offer, and there is also a coupon from ebay, if I use both of them, it will not be very fair?

There is a 10% coupon from ebay and today there is a discount offer from a seller. If I accept the seller's offer, can I also redeem the coupon for 10%? Or you can use one of them