Wiring problems of the 2019 Hyundai Elantra

After having my 2019 Hyundai that I bought brand new my headlights quite switching to high beams and would only run low beam headlights but instead of being bright they were dimmer than what they were suppose to be. I tried to exchange the headlights to see if the bulbs were burnt out and even with brand new bulbs the head lights still wouldn't switch over to high beams and were still very dim with brand new bulbs. Took it to the dealership and they couldn't figure out what the problem was even though I told them there was a burning smell coming from the wiring harness for both headlights and what looked like a relay board for the bright light switch looked burnt up instead of it looking like a shiny new silver board. Then about a week later both headlights went completely out and I couldn't drive at night due to not having any headlights so I replaced the bulbs again and again they gave me a dim light with no high beam lights. So to this day I am still having problems with . My headlights and no one from Hyundai can seem to figure out what's going on on this brand new 2019 Hyundai Elantra se.