Do not think it is the wisest choice to ask me, the buyer, to come down all the way to your showroom. It is convenient for you, the seller, but inconvenient for me, the buyer. I paid for the courier service first time to enjoy this convenience of not travelling, which save my transport cost and time.
Moving on, we need to solve this issue. Can I do a video recording? And you see if it can be solved or verified this way? If it’s is really defective and unsolvable, it’s you, the seller’s, fault. Because you sell a defective item. That’s dishonest. You should bear the cost of transport to take the defective item back and send me a new functioning one. Or alternatively, refund the full cost to me and take the item back via your own paid courier service. Stop wasting each other’s time. Let’s solve the problem in win win situation. Not only to your convenience.