Seat Belt Problems of Toyota Previa

I went to ventura Toyota to seek repairs on my seatbelt for my recently purchased 1995 Previa based upon the 1997 iihsa crash tests which determined that the energy management loop in the belt was a dangerous defect. I was told that there was an updated part for the vehicle, so I ordered it and had it installed on 8/4/16. After getting the vehicle back I realized that the "updated" part was not an updated part but was instead an older 1993 part which also had the same defect. I returned to ventura Toyota and they acknowledged that it was not an updated part as they had represented. However, they are unable to make further repairs because there is no updated part. They have also refused my request to remove the part which is not as was represented or to refund my money. Toyota has misrepresented the nature and type of part they were installing on my car and has knowingly installed a defective part on my vehicle which contains the same defect and is older the one I specifically requested be removed.