Much thanks for all your replies and advice!
As mentioned, I talked to the shop manager and I can return the 70D and get my money back.
The shop is ok, they would have exchanged the camera. But they do not have one anymore, as they got just two dozen of them. And Canon told me to get it repaired, what I think is not an good solution for a new camera.
I will order a new one when my money returned to me.