How to file a complaint again Toyota Car dealer?

Can anyone advise me how to file a complaint for a Toyota that I bought two years ago. I noticed the new car was hestitate to accelerate from time to time when we bought it two years ago. I took it back to the dealer few times and they could not find out the cause until recently they said it was something wrong... show more Can anyone advise me how to file a complaint for a Toyota that I bought two years ago. I noticed the new car was hestitate to accelerate from time to time when we bought it two years ago. I took it back to the dealer few times and they could not find out the cause until recently they said it was something wrong with the transmission. They will fix it (still under warranty) but I am kind of upset. I want to take it to the corporate office level. Sincerely need your help. Thanks so much in advance
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