Timing Tensioner problems of the 2003 Cadillac CTS

I was driving downhill on dallas rd in west richland, wa I started to apply brakes to turn into quail springs apartment complex, idk whether it was due to the road or the way I hit the brakes but it moved my key out of the run position causing the engine to turn off, I was slowing down progressively from 55 miles an hour and heard something that sounded like my engine had fallen apart. After getting it stopped I popped the hood and noticed damage to my tensioner pulley it had came off and my serpentine belt had shredded, I called and got it towed to the nearest place I could to get it looked at. When replacing the serpentine belt they said it'd be good to check the timing belt as well just in case. Upon checking it they noticed pieces of serpentine belt had gotten inside of there somehow causing the timing belt damage. With this type of engine if timing belt gets ruined 98% valves and pistons kiss which causes bent valves on the head. I was told the car would not run anymore unless I put a brandnew engine in and they wanted to charge me 6000 for that, I looked up a used engine on ebay for 650 they still wanted 3000, I don't have that kind of money sitting around and have been suffering without my vehicle since this happened. I've missed work and am lucky me or child weren't hurt during this situation. I called the local Cadillac dealership this morning and explained what happened the guy I spoke with was very rude and told me theres nothing the could do to help me, I asked about the recall again and he said I need to call corporate I dialed the number he gave me and didn't get thru to anybody. Lucky I looked up the number myself explained the situation to them they gave me a case # and said I'd be contacted within 1to 2 business days by a senior advisor. Bottom line is I'm still stuck without a working vehicle due to this recall.