3 D Marble & Granite

We recently had granite installed in Venetian Gold in our kitchen. We went to 3D Granite for the installation and the picking out of the color of the granite. The lady was very helpful and answered all our questions. However when the time came for the actual installation of the granite, let's just say that did not go well. Our piece of granite had a huge black streak in the middle. They told us that this is just a natural variation but it just would have been alot better if we could have seen and picked out the actual slab. Now in our kitchen is this giant black streak.