we don't know what the debt was for. See IRS PUB 4681, you may be able to exclude some or all of the debt from income https://www.irs.gov/pub/irs-pdf/p4681.pdf
also see form 982 which is how you would report that some or all is non-taxable.
https://www.irs.gov/pub/irs-pdf/p4681.pdf
if you are saying you don't owe Wells Fargo the money you'll need to contact them to straighten out the matter.
