Sold a guy 2 4tb ssds that showed up on my pc perfectly fine then he messages me back 5 days later saying they both dont work, when he tested them both on the day he bought them they both showed up in disk partitions what do I do from here, i sold them to him for $700 for 2 when they are $900 each new, i suspect hes trying to take advantage of me because im still only a teenager, and both the ssds showed up when I tested them before I sold them