I feel the pain here. These engines are defective. We have a 2013 Sonata with the recall and it is burning oil. It is better with the 5W30 than it was with the 5W-20 weight oil that the manual recommends as preferred. I keep topping the oil but it is tricky as my wife is the primary driver.
I don’t think BBB would help. I have not seen them do much anyway. Maybe take Hyundai to small claims court.