I had the same problem. I am a mortgage lender for Wells Fargo and I tried paying off an account that originally had a balance of $1100 and due to nco's frivolous fees the supposed debt had grown to $2300. I set up 3 installment payments and paid the account. After 2 months of fighting after the account was already paid I verified that the debt had been paid by providing canceled checks, bank statements, phone calls from my bank to verify that the funds had cleared. Long story short, it took about 3 months, 15 phone calls and several escalations to management to get my pay off letter. Not only that they broke the law several times by calling me at 5:30 AM and violating the fair debt collection practices act.