Maruti Suzuki — Pressure plate faulty after 2000 KM

Address:

Kozhikode, Kerala, 673524

My vehicle is Maruthi Ritz number is KL 56 D 2461. I replaced my clutch disk and Pressure plate after 46000 KM of drive and now I am facing mileage shortage and 2 steps during applying clutch. I approached Maruthi Service centre Indus Motors Vadakara, Kerala. and the part was replaced from Maruthi Service centre Indus Motors Koya Road, calicut, Kerala. But unfortunately these people are saying itz got damaged because of my wrong driving skills hence they cant replace the part. But still question there, If I am not driving properly how could i use the first clutch and pressure plate around 46000 KM.