Engine fails at early stages: engine that tata cannot handle but maruti handles the same nicely

We have been getting our Manza car HR26BE6349 (October 2010 purchase) serviced regularly at your Authorized Service station Dhingra Motors, Gurgaon (Haryana).

We recently sent the vehicle for service and also complained for having lesser pickup at lower RPM.  The advisor suggested for turbo change and complete engine rework (on April 2013 just 2.5 years).

As the vehicle is covered under extended warranty, we expected the work to be done under ext warranty.  But to our surprise the surveyor has refused the warranty claim.  The reason given is the minor dent in the sump.  The dent being 2-3mm.

Being a design issue why didn’t TATA Motors recall the vehicles.

The Car 's bottom touches each and every bump if not driven carefully.

When the swift/ swift desire are completing 2-2.5Lac Km with the same engine, every Manza/Vista is failing at early stages. This shows the serious design issues by TATA.

On the most nobody responds to the complaints.