2002 sonata brakes and rotors

i recently purchased a used 2002 sonata with approx 55,000 miles on it. the back and front brake pads and back rotors needed to be replaced within the first 200 miles that i drove the car. the shady dealership
that i purchased the car from did (very reluctantly) pay for most of the work done. now, less than 3000 miles later, the check engine lite is on and i'm told that the back rotors are shot again. does this problem sound familiar? should i try to get rid of the car? i told the mechanic not to replace the rotors and i'm getting a second opinion but is this characteristic of this car or what? any advice is appreciated.
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What was wrong with the rear rotors to begin with, how did the dealer rectify the issue, and what is wrong with them now?
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the brake pad on the rear right tire was worn down to the point the car sounded like an airplane cause it was metal on metal, and it even smelled like synthetic burning from all the friction. the same EXACT damn thing is happening again now, only a month and a half after i had the entire freaking brake system replaced. im thinking the brake is locked or something causing it to be permanently using the brake and thus wearing it down. i dont know how else to explain a band new brake pad being TOTALLY used up to the point there is only metal of the disc left after 2000 miles of driving when they usually last 40 thou easily. i really think im going to sue the dealership. they also but 2 quarts too many in the engine. the engine could be messed up now. i cant believe this bullshit, excuse my language but this is insane. anyone know what could be causing this? i think ill have to sell the car cause no one knows whats wrong and i cant put out 200 dollars every month to replace brakes and rotars....which are being carved into right now cause there is no pad left. please, someone help me. im a college student, i dont have any money. i cant deal with this.
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