Frame Rust problems of the 1999 Suzuki Esteem

I own a 1999 Suzuki Esteem, 55,000 miles, car is kept in a garage. My sub frame rusted in half and broke. The aaa person that towed the car, 2 mechanics, and every male I have told are appalled that this could have happened. My mechanic called fred martins Suzuki, where is was purchased, and spoke to the mechanic there. He was told 3 subframes had been fixed during the month of July, but no recall was made. This is supposed to be one of the strongest parts of the car. Fred martin Suzuki has informed me that nothing can be done , after all the car is 6 years old, not under warranty, etc. Do I have a legitimate complaint, seeing as this could have caused a fatal accident had it broken while driving on the expressway. Is this something to be expected of a six year old car? the car was repaired at the cost of $1,100. I do not feel safe in the car, but haven't the option of buying a new one at this time.