HTC — mother board misfunction within 3-6 months for desire SV

Address:

New Delhi, Delhi

I purchased HTC Desrie SV on 4th Jan 2013 with IMEI no [protected]. Since after my purchase I had to get my phone's mother board replaced. 1st time on 02/09/2013 even before completion of warranty period 2nd time on 22/01/2014 3rd time on 17/06/2014.. 1st time change for mother board was done free of cost as it was in warranty period. 2nd time I had to literally fight with customer care executive as i was asked to pay i don't know how much % of mobile cost. 3rd time I am happy to hear that I am getting 20% discount on the cost which totals to Rs. 5000. I really don't understand what kind of mobile HTC is manufacturing and what kind of engineers is has employed that the mother board so replaced does not stand for more than 3-6 months. please help me in this regards as I has spent Rs. 21000 buying this pathetic mobile.