Toyota — steering vibration while applying brakes

1. Its vibrating if i apply brakes why?
2.ac system not working since 6 months
3. Dealer is rejecting to do servicing of my vehicle as am complainig, e
No response from company even after repeated mails (App 50 times), dealers final words who asked you to purchase our vehicle, you shouldnt have purchased our vehicle, no other vehicle in india has problem except yours. Is the final word from dealer!