Consumer Redressal

I have purchased Q1200 ((911372150050111) from XOLO. On the 12th of June, I bought a brand new XOLO Q1200 mobile. However, upon three months of using it, problems started to appear. The battery is no longer working. Also, the display is no longer working. I was very surprised to discover such problems in quite an expensive model. I submitted it at the service center and got it repaired. After using it for two three days it again started having problem, and this time its display was gone. Naturally, I returned the mobile phone to Xolo service center to be repaired (work order number 310001071009) on 9th January. On 3nd February I got the call that my phone has been repaired and I can collect it. I went to the service center and instead of my brand new phone, they provided me an old white colored used phone of Q1200. How can they provide me an old phone for my phone which I submitted you? It took them like 25 days to give me an old used phone, this is ridiculous. I am very upset from th