Frame Rust problems of the 2007 Hyundai Santa Fe

2007 sante fe limited, sage grey one owner, garage kept, maintained regular basis, low mileage 84,000, interior and exterior in excellent condition with a kelly blue book of $4200 to $4600. Purchased at lauren Hyundai in glenview and maintained at Hyundai lincolnwood, IL along with my regular mechanic. I learned yesterday that the right rear of sub frame rusted out with a both front frame rusted out and has a hole in it. It's a know issue by fed, NHTSA, series of recalls and dealer rusted out frames, sub frames and other part repairs and replacemetns. The 2007 treatment didn't work and the same issue is all over the internet with class action suits. I've also read low and high mileage cars within 2-10 years have same issue but must be covered under warranty. They resolved the older ones by spraying them one one recall and didn't upgrade their sub par parts for us cold weather salt belt states. I now lost the value, cant sell it outright and the car is deemed unsafe. I'd like assistance getting this looked at and repaired. Yes old but in great condition mechanically with a vital part of the car not code for chicago from the beginning with a continued issue up to today. Cars that were new and a few years were getting them replaced. I that even safe after the repair? I still have value in this car and I shouldn't have to forfit from gross negligence on Hyundai motors on a vital part of the car. I was considering a trade but now find out its a major safety issue for many models. I'd like to get this looked at, repaired or work out some type of solution. Any assistance you can give me is greatly appreciated. The dealer said it's old and acted like they had no idea. Thank you.

Hello so I took my 07 Hyundai Santa Fe limited 98k miles to a garage to get some work done and they put it on the lift and stoped the work to call me in to see that my subframe in front is rusted through big chunks of metal missing mainly on the passenger side of frame. I was told that their is a recall about this and that Hyundai has replaced the subframes as a result of the recall I have no idea why under the car only that one area it's rusted but the rest of car is fine. This is dangerous and was told at any time the engine could fall through. I will attach some photos of it the best I can. Hope you can help. I got kids that ride in this and I'm now scared. I never received anything in mall the about the recall. I was made aware of this major issue November 29, 2019.