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I'm sorry to hear that but you have to contact your local Xperia Care
i got the same problem i just z3 dual and it slip from above my laptop on the same table where the laptop was on and it got a crack in the back side the crack .
My phone's crack like of yours and also the phone's screen has little bubble.
You have to contact your local Xperia care
I gave to the Sony service my phone and now waiting. I hope it will change and give it new Xperia Z3..
I will inform the support forum for news from Sony Service.
That's good news.......well done & enjoy