Santander Car payment/certified mail/produce new loan agreeement that doesn't exist

Santander Consumer USA                                                                     Linda Joy Adams
PO Bx 660633                                                                                      certified mail
Dallas, TX 75266-0633                                                                          acct#
My attorney has advised me that I have a binding contract to pay a set amount per month until my car is paid off. I 've never been late or missed a payment in 42 months. My original loan was with Household Bank Auto Loan. Last year, you bought the contract from another company who'd bought the contract. I never negotiated any other signed agreement after the initial one. Usually, you are paid each month before you bill arrives as happened this month. You've decided I should pay an additional .60 per month in violation of my contract/loan agreement. My contract allows me to pay on the principle but info was to pay this in a separate payment and designate it for the principle. My bank can't sen less than $1. I have directed them to send this to you and it is to reflect in the pay off balance. Each month you will receive the signed loan amount and a separate amt of $1 to be applied to the principle. My due date is 3/20/11, My bank says the $1 should be on time. No person answers your phone. Looking forward to paying off my car earlier with your assistance.