Tecno Mobile — my phone is not working properly

I am using this mobile from 8 months, i have faced a lot of problems from this mobile. It won't support google play store, we cannot update or download apps from the google play store app. If we clear the cache it won't work for seconds. The earphones provided by you people are the worst earphones i have never seen before. If i start listening music from that earphones i feel like i want throw my phone. Sometimes i feel that if you have given this phone at free of cost i would never have taken this mobile. I am most eagerly waiting to file a case on you people in the court. Take it as warning, i want to get repaired of this mobile at free of cost in such a way that it should satisfy all the features provided by you people