Toyota — steering wobbling

Address:

Chennai, Tamil Nadu, 602105

I am C.Paul NIcholas from tamilnadu i have purchased a toyota innova crysta in july 2017 from Lanson toyota, Chennai. car no. TN 87 3888 i am facing problem while braking at speed condition in highways, as the car steering starts vobling, - i faced this problem in 15000 kms then they did skimming again the same problem repeats in 18000 kms again they did skimming now the vehicle done 28500 kms - now again the same problem accured. when i asked to change the new under warranty - they are not willing to change the new one again they are preferred to do skimming