[Resolved]  Bagga Link — maruti alto lxi

I have purchased ALTO - Lxi from bagga links True value car dealer, After few days one noise from Gear box started comming, I went to bagga link and told about my car problem but engineer of the car was not ready to except but sum how i proved there is humming sound comming from gear box , They kept my car two days the problem is still existing , please advice what to do and where to complaint against them.