Yu Yureka — Fraud company

I have purchased Yu yureka mobile from Amazon India on 9th April, 2015. Then I realized that there is some problem in MIC, because caller can not hear me proper. When I called yu yureka customer care to resolve this issue, they have passed 15 days. Every time I called, they give me any technical idea. i.e. reset, hard reset, flashing etc. After all problem is continue, but they are not giving any response. Worst customer care experience. Bogus company, Fake company