Most practices will have a very firm policy of no refunds. This is because anyone can say they are not happy and demand their money back. A little tweaking with some hyaluronidase to partially remove the fillers can easily correct the unevenness. Most doctors would not charge you for that, since there is clearly visible unevenness. As for the lips not looking full, you would need more fillers to make them bigger in which case it would not be unreasonable for the doctor to charge you for more fillers. The unevenness can also be corrected by adding more, but my suggestion would be to remove a little bit to make them look more even, your lips look very full. Try to focus on getting the result that you want instead of trying to get your money back.