Nokia India — no network in phone ( NOKIA LUMIA -520)

Address:

East Singhbhum, Jharkhand

Dear Sir I bought nokia lumia 520 in the month of september 2013. after using for 8 months it started showing charging problem. i submitted my phone to the nearest service center but they were not able to solve this problem. then they sent my phone to NOKIA head office. After keeping my phone for 3 months they changed its mother board. After 2 months o[censored]se the mother board started network problem due to which my phone could not get tower from any sim. now i dont have any warranty but still i went to service center to get a paid service . they took Rs 600 from me as service charge but problem not solved . then i went to another service center . the technician told me to change its mother board again which will cost Rs 4800. sir being a student how will i pay this huge sum of money. as the mother board was replaced by nokia it should take its responsibility and replace my phone. sir, i heard of nokia being a good and reputable company. pls give me justice.