[Resolved]  Lenovo Y410 — service problem

I am studying in NITIE, Mumbai at our Institute we have purchased near about 50 laptops of lenovo product.
But many of them are defective we have been cheated by this company...
Many o[censored]s facing lot of problem such as net connection, webcam is not working, somebodies touchpad is not working, speed of laptop is too low though having 3GB RAM and 1.83GHz, keyboards some keys not working, hard disk corrupted.
We many times had made phone calls to dealer names Tushar... Every time he is giving assurance that his engineer is going to come and visit...but since 2months everyday many of them are calling but he is not giving service...Just now we have purchased 2 months ago and it is having 3years warranty...
Plz do help us...
As we are suffering...