From what I read dont expect them to actually look into anything and only continue to bill you and call requesting money. I would not send them 1 penny and say you are referring this to your attorney and request they send you ALL the documentation broken down charge by charge with pictures and legal documentation stating this was done within the proper time because all the documentation YOU found says it's not and you are forwarding it to your attorney for review.
Dont fall for their BS bluff. You can see a lot of people have had similar issues with them and Toyota never does what they say they will.
Top 142 Complaints and Reviews about Toyota Financial Services
Make sure anything they tell you that you also get it in writing.