Lenovo k3 — Motherboard and battery issue

Address:	Mumbai City, Maharashtra, 421204
Website:	flipkart

My name is aditi i bought lenovo k3 note from flipkart on 19 08 2015 within 2 months the motherbord was damaged and the battery as well the service centre got it repaired for me, but as soon as the phone was repaired the speaker was giving me issues the sound that was produced by the speakers was completely cracked, i ignored it saying any way i dont use speaker, however i started experiencing the same issue for draining battery within 15 days . I returned the phone to service centre and they said that they need to change the battery and the motherboard again. Is that motherboard and battery going to work only a month or 15 days and do i have to replace it every month. Please help me i think the phone itself is defective i have checked the service centre and the lenovo customer care they say if the motherbard gets damaged 50 times we will change it 50 times . is that how the service . I humbly request for a replacement of that phone. details IMEI number [protected] mobile number [protected]