I'm sorry for your situation, but why didn't you read the contract before signing it?
Everytime I financed a car, it was very clear on the contact how much the monthly payments were going to be.
RECEIVED THE LOAN DOCUMENTS FROM THE DEALERSHIP FOR YOUR PURCHASE IMMEDIATELY!
There is a chance that your loan documents were altered, or even forged by someone at the dealership!
If this is true, then you have a way OUT of your loan because if any tampering of legal documents took place by someone at the dealership in the processing of your loan application, then that's a CRIME, and you have rights.
Make sure to get ALL copies of ALL pieces of loan documentation that the dealership sent to the bank. The MOST IMPORTANT PIECE is the CREDIT APPLICATION!!!
This is the one that has your name, address, date of birth, social security #, employment info, etc.
Make sure to check and see if the application is the same one that you filled out at the dealership with all of YOUR SIGNATURES!
Also check the 'EMPLOYMENT SECTION' to see if your MONTHLY INCOME was altered. If someone at the Toyota dealership altered your income by RAISING IT in order for you to qualify for the car loan, and you can prove it, then you WILL WIN, & you can also sue the dealership for DAMAGES.
You MUST get all the copies of the loan documents from the bank IMMEDIATELY! Read over every line & make sure it's all true & accurate! Check for an EXTENDED WARRANTY that may have been put into your loan without your knowledge.
Keep us posted.
GOOD LUCK.
P.S. If the bank or finance company won't send you copies, you can be sure that some 'HANKY-PANKY' took place. DO NOT TRUST THE DEALERSHIP! Remember, they have copies of your loan agreements too. They won't do anything to expose themselves. GET THE COPIES FROM THE BANK, AND MAKE SURE to get a copy of the CREDIT APPLICATION that the dealership sent to the bank!!!!!!!!
Also, if your loan went through Toyota Motor Credit Corporation (TMCC), they will not necessarily want to help you because they will always be on the dealership's side, and will always help their dealers to avoid any legal problems. REMEMBER- Toyota Corporation NEEDS its dealer network in order to sell their vehicles, right?