[Resolved]  Acer — service centre not repairing faults

Dear sir,
I purchased an ACER ASPIRE 5920 in august 2007 from PROLAB COMPUTERS SECTOR 16 FARIDABAD.Its still in the warranty period. I have this problem that my laptop shows display only at few orientations of screen, only few screen angles .At rest of angles i cant see anything at the screen. I gave my computer thrice for repair to above said shop, they took it to the setvice center in lajpat nagar delhi.But inspite of all this the problem has not been solved .I am just fed up giving my laptop again and again for repair and even after that no improvement has be done by them.service centre people do smthing and my laptop works properly for 1 week and then back to display problem.Help me what to do.I think the company gave me a defective product .what can be done in this situation now.
I am fed up going again and again to the computer guy for it and dont want to contact him any longer because of highly unsatisfactory service. my laptop details are-
ACER ASPIRE 5920-5A2G16MI
mfg date-0806
S/N - LXAKV0C0118220D6B72500
SNID- [protected]