@whisky
My Alto was hit by a racing honda city (on the left fender)and I felt the same problem for quite some time even after all the repairs were done through my insurance company.
After feeling this for about 6 months, I sent my car to Olympia motors (Suzuki 3S dealers) and they have identified the chassis to be damaged (bent wrongly) along with a lot of susspension issues. Upon charging a pretty heavy amount, all this along with the chassis was fixed by their denter and now the car seems to be fine.
I think you should get the car thoroughly checked for suspension / chassis issues.
Regards
Abid