Sue who, and for what? If you filed Chapter 7 and got a discharge, and did not reaffirm the mortgage, then the credit report is correct. There is no debt that is "not included" in a Chapter 7, and "settled" is not an actual event in the Chapter 7 case, so your post is not clear on the important details of your Chapter 7 case.
IF you held the mortgage loan when you filed your chapter 7, then technically your debt was discharged in bankruptcy. The mortgage lender could never have pursued you for any remaining balance. However, the lien, mortgage or deed of trust, survived the bankruptcy. In order to get clear title you paid off the lien voluntarily. The credit bureau can report the bankruptcy discharge. Sorry.
It's apparently my minority position night amongst my colleagues...
IMHO, an account can be paid as agreed (timely payments, in full, etc.) even if the obligation was discharged in bankruptcy.
Wells Fargo has the legal right to pick and chose their customers based on a lot of factors. If you want to challenge something on your credit report, before you have the right to sue, you must comply with the provisions of the Fair Credit Reporting Act. The link to this law is below. Hope this perspective helps!