Steering Noise Problems of Chevrolet Trailblazer

I purchased a used 2007 Chevrolet Trailblazer 15k in June 2008 form bob bell Chevrolet eastern Ave. Baltimore, MD. This vehicle was advertised and assured to be a gm certified vehicle which was reconditioned and 117 point inspected under gm certified used program. I don't believe that this vehicle underwent this inspection as the dealer represented because a week after purchasing the vehicle, I had brake failure and traction control malfunction that the dealer repaired and assured me that I would have no further problems, on top of that, the oil wasn't changed or air filter which was as black as the street when it was changed out. Now a year and a half later, I'm having noise in the steering column and was advised that a noise I was hearing in the front of the vehicle when I went over a bump was my struts that needed to be replaced when I took it back to the same dealer purchased and advised my vehicle which is now at 47k is out of warranty for the repairs needed and I was going to need to pay almost $2000. My problem is I haven't had this vehicle that long and my dad owns the same year and model vehicle with zero problems, I have never had a vehicle which was supposedly as good as new with these issues. The dealer hasn't gotten back to me and I feel like they are avoiding my problem which I believe was their fault and should be fixed because they represented themselves and this vehicle to me as such and that was under the condition of my purchase, can you offer me any help or advice???.

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