Mercedes-Benz of Omaha

I purchased a CPO C300 6 months ago because I enjoy the peace of mind that CPO vehicles have. I went to trade-in/upgrade to find out it was in a major accident with frame damage (welds are visibly done by hand in the entire rear/drivers side door jam). This was not disclosed to me, nor did I see it on the CarFax at the time. It is not uncommon for CarFax to have delays, especially with accidents that happen a few prior to purchase. I'm not in the market of buying damaged vehicles. How this C300 managed to get CPO status is beyond me. Their solution? Let's offer a trade in $1k less than NADA value instead of buying it back. They offered to help to get into the vehicle was after (at an auction) and refused the price I said I was willing to pay...clearly the only thing anyone cares about over here is profit margins. Thank you for the unsellable, damaged goods.