Compaq laptop — Mother Board problem and no cooperation from service centre (Vintech, Pune)

Hello,
Model- Compaq- Parsario V3424AU
Serial No. 2CE73140SX
bought at- Laptop House Pune
Given at service centre- Vintech electronics authorised service centre from HP, Model colony, Deep Banglow Chauk, Pune on 29th Dec. 2008
Dint recieved till now, today is 3 Feb 2009

I bought this laptop about 1 year ago. Now after the one month of its warranty expiry date it stopped working. Then I went to the Vintech service centre (on 28 Dec. 2008). They told me that, mother board has to be replaced. They also said that this problem is from company so u dont have to pay any charges ( I knew it b'cuz some of my friends got there mother board replaced from the same centre without charges). Now I am going there on regular basis ( today is 3rd of Feb 2009), they do not give any satisfactory answere about my laptop. two times they gave me my laptop and said part has been changed but when I took it at home only after 1 hour it stopped working. some time I get the messeges that your laptop part has been received and when I go to the centre they says no we dint get any part. I dont know who is making me fool, the company or the service centre. I m totally getting irritate.By profession I am an MBA student and just waiting for getting placed. But this laptop problem is directly affecting my studies. This is third time they said we ordered Your laptop part.
Please help me out, I heard about these forum from my friends that You can help me out in this issue. Please convey my messege to the right authority.
Thankyou,
Mahesh Namdev
Symbiosis Institute of Health Sciences, Pune
email- [protected]@yahoo.com
mob. [protected]