Wells Fargo Credit Card Complaint

Wells Fargo Credit card department,

APR or interest rate Alabama

I have - credit card accounts with Wells Fargo. I accidentally paid off the wrongcard and now they have charged me the accrued interest on the only remainingcard. I mixed them up and paid off the card that was n't due until - and thecard due in -/-/- has been charged over $900.00 in interest. Both the other cards were paid off. I did not have any late payments, all monthly payments on all -cards were paid on time previously and I have excellent credit. This was a terrible oversight as I have - serious illnesses and I am on -. I have sent them a letter by a fax - times and they have not responded. I can pay off the entire balance due ( minus the deferred interest ). I have no money otherwise for this deferred interest as I am on a strict budgetfrom -. This was a terrible mistake and I am begging someone to helpme with this.