Do you have paperwork from your order for the counter tops? Since there is both a quartzite (natural stone) and a quartz (manufactured product) named Taj Mahal, it appears that is this is not what you thought you were ordering. When you say that you didn't pick your stone, and that it was fabricated, it seems that you got the quartz, not the quartzite that you may have seen photos of online. Here is a link that might be useful: image of Pental Quartz Taj Mahal

I just had Taj Mahal installed and it too has the same look that you described. Did you find a solution to fixing the finish?

I agonized over my counter top choice. I wanted marble butcouldn’t find Danby marble anywhere. I love Taj Mahal but didn’t care for any of the slabs available at three stone yards. I wanted a very non busy counter top that I could use a patterened tile with but finding samples of Corian was a pita plus I really wanted natural stone. I just couldn’t pull the trigger on quartz even though I found many lovely options. I finally decided that the counters were more important than tile. I finally found slabs that wowed me. It’s fairly busy but gorgeous Mont Blanc quartzite.

You want more than just shine. You want to be able to stand back and bounce low-level light off the top. You shouldn't see any waves or dips in the top where they fixed the crack. If you do, they have to grind a larger swath and feather it in.