Lenovo — online purchase lenovo mobile phone

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I purchased my Lenovo mobile phone online on 22/04/2017 and since then I've visited the service centre 3-4 times which is too many times for a just 7 months old mobile phone. First visit was for non working of the keyboard where the main board was changed by the service provider. Secondly I had to visit because my phone would not charge, so I had to purchase a new Lenovo charger as my phone charger won't work. Third time my phone was damn adamant to charge by the new charger, where I came to know that my phone IC was not working. And recently my phone is so reluctant that it will not stop troubling me, I CANNOT HEAR WHAT THE CALLER IS SAYING neither the CALLER CAN HEAR WHAT I SAY!!!
I've had enough of trips to service centre which is the only service provider for LENOVO in Goa, almost 40 km from my place.

I don't want anymore servicing of this phone and would want a replacement for this handset.