Check your CPU. I ordered mine from the Qoo10 store too. Its not using Mediatek MT6589T chipset!
Also check your phone's IMEI number against the one on the box. Mine was different!
I went down yesterday to Sim Lim and inform them about it. They were very surprised! They did a check on the CPU of another set, noticed the discrepancy too and refunded me my money back. And today, when I checked the Qoo10 for their Xiomi ad, it seems they have stopped selling it. My guess is they ordered fake ones unknowingly.