www.nubiamobileshop.com / Cowboy Trading
In May of this year, I used nubiamobileshop.com to purchase a Nubia Z9. They sent the wrong device and two up to two weeks to acknowledge this; telling me in E-Mails that I was wrong and that the system does this and that etc. - nonsensical points that suggested they weren't too technically-minded.
They did answer almost every E-Mail but each one was quite pointless as they were template E-Mails e.g. "do not worry, we are nubia mobile shop, we will answer you soon". I sent back the device, they didn't acknowledge it but kept the money. Long story short, after 3 months, PayPal returned the money after nubiamobileshop.com stopped communicating with them and me.
Avoid this online 'shop', it's really not worth it. If you just go to their website and click on a device, you'll see for yourself many people complaining.