Micromax Canvas Nitro A310 — My phone is not returned from customer care

Address:

Chennai, Tamil Nadu

I bought my phone on sep-14 and i got problem on my phone on june-15 . Phone not charging . I think the charging port will be problem . .They said to change the board .The customer care take nearly 25 days to service .They called to get the phone but while charging again same problem . They took nearly two weeks but still i not get my phone. They are saying we are working.