Underbody Shield problems of the 1999 Honda Passport

I had my vehicle inspected during a routine oil change. The mechanics showed me extensive corrosion on the frame of my vehicle. They said it was unsafe to drive. After doing research online I found out a recall for a suspension bracket expired. But I also found out several other owners had extensive corrosion and Honda was working with them on the frame corrosion which was identified during the recall but was not part of the recall. I called Honda and the dealership and they said since the recall expired they would not do anything. Again, it appears Honda knows of more than usual/severe corrosion of the frame on this vehicle and has dealt with a few consumers on it. But when I ask they say there is nothing they can do. I need help. It appears there is a bigger problem than what they initially started the recall for.

Went to my mechanic to have a new alternator put in and when he had it up on the lift noticed severe rust on the frame. He notified me that the vehicle was unsafe to drive and recommended getting rid of it. I told him I could not because I had purchased the vehicle a year ago and still owed money on it. After doing some research I realized that this was apparently a common issue with these vehicles. I have taken my vehicle to a couple welding shops and one of them told me it was too risky to try and repair it and the other told me they could try and do some repairs, but of course could not guarantee that it would last any longer. My vehicle was originally purchased in ohio which was one of the states included in the recall and it remained in that state until 2010.