Why is my 2024 EB rusting wtf

Hey, got my 2024 mustang used with like 4k miles. It did have an accident to the side but they fully repaired the car. I attached a photo and video. Don’t know why but the car panel on the side is legit rusting and the door sounds like it’s gonna fall off. Bought it less than 5 months ago and it’s legit a 2024 ecoboost premium convertible. Lmk what I can do.