My N70 too went dead (well almost).
At night it was working ok, when I saw it in the morning the display was all bad. Restarting, change SIM, change battery -- nothing worked
Service center asks for 2.5k and guarantee of just a month after repairs. Just took a new cell but have kept the old one due to data stored in it. Will still try to recover it. Contacts have come in new cell. Bluetooth worked in old!
I too took it for around 21k. So probably we took it at the same time. Does N70 have a 2 yr life span?