I really think you should give your plants a bit more chance before giving up on them- a week or so and watch the new growth.
That Papaya is a nice knockoff. They did a good job. Watch for unusually resinated individuals; I even got a resinated MALE in my pack and bred him into a Papaya F2 to back up the genetics and share with buddies. It's also easy to grow and the product is VERY pleasant.