Consumer Redressal

i bought dell vostro laptop in oct 2014 with a warranty of 1 year. laptop got problem in motherboard and was repaired on 31st march 2014 by a dell technician. Gain it got problem on13th of June 2014 upon which i was advised by dell helpline to contact dell service centre in Lajpat nagar.At service centre i was asked to submit laptop for 3 days and so i did there on 16th june. But on 19 th june i was told that laptop contains non dell parts as motherboard so it can not be repaired or made right...sir,neither i opened laptop nor was given to any one except dell technicians so there is any part non dell it must be added in lieu by a dell men.. But they are refusing service.it is breach of trust as well as criminal conspiracy. please help me am a student at IIT delhi from a middle class family.