Phone not working

[#1]

Please help me. I have purchased Sony Ericsson Naite 6 months back and it is giving me problem every week, I get it rectified from authorised Sony Ericsson Center, but the phone will work fine only for 2 or 3 days I have visited the Service Center about 10-15 times till now, they have also replaced the motherboard twice. Nothing seems to workout. Please tell me whom to ask for replacement, the dealer or the manufacturer? What should I do if the dealer refuses to give replacement.

[Dr_Chris]

After so many visits to the service centre to no avail, the dealer should now replace the handset; otherwise contact SE for advice.

[#3]

Thank you so much. I will ask the dealer tody.

[higwayman]

you didn't say what kind of problem?

if its calling or drop calls, it could possibility network coverage, network congestion, not enough bandwidth and these  are infrastructure problem.

I deduce it from your comment that it works 2 or 3 days , then it don't work.

Any more clues?