Yu Televentures — yu5010a

I purchased yu5010a on 24nov2016. It worked well for 8months (Aug'2017). After that the touch is not working at some locations. I submitted in etawah, up micromax service center on 07oct'2017. They said that, "panel problem" and it will be replaced as this is under warranty. It will be returned in 20working days and you will get a message when the mobile was serviced. But till now din't get any message/call. Even if i call them, they are telling that spares are not arrived. We wrote lot of mails also, but no response from high authorities. I am tired calling them again and again and listening the same story for last 2months 8days. What's the use of purchasing these mobiles?