Bought my Punto 1.3 Dynamic on 25 Dec 2013 and it has done 19000 KM. Now I am facing issue in he rear suspension.I am getting cranking sound in rear suspension. when I travelling alone I use to get sound rarely like in a Big speed bumps. When it is packed with four I use to get cranking sound very often and sound is also more. When I checked with RDC motors chennai they are saying the issue is in the back seat which is not locked properly and they said we did some taping to reduce the noise. But after that also I am getting this noise and it is getting bigger and bigger. Sound is almost like you can hear in a huge truck when it goes in a bumpy road. What should I do?