Wachovia Mortgage / Bank (Now owned by Wells Fargo Bank) rips off people two ways. First by introducing their own made-up index (COSI). Secondly, by adding an unreasonable margin. This combination results in rates higher than any index (sometimes 4-7% higher than Prime). As a matter of the fact, this practice results in an interest rate higher than most Equity Line of Credit. And even after Wells Fargo Bank has purchased Wachovia, they are not willing to address this issue. The impact of high interest and neg. am. could be devastating. And it could result in missing payments and possible foreclosure. Wells Fargo Bank needs to do something about this by providing a fixed interest rate and lowering the adjusted principle due to negative amortization.