Shoddy Granite Install

I had uba tuba kitchen Counter (http://GialloFiorito.com) installed this week. The Counter (http://GialloFiorito.com) is 8' long L-shaped as it turns a corner. It is a bit over 4' wide at the corner end. There's an undermount sink in the center of the Counter (http://GialloFiorito.com) . The fabricator/installer guys came to do the install. I, stupidly, never saw the original Counter (http://GialloFiorito.com) slab they brought - I left them to do their work. After about 30 min. they told me that there was a problem - they broke the slab - at the center of the sink, which would be the weakest part. They showed it to me. They come back the following morning and (http://maplered.com) bring in two pieces that will join and (http://maplered.com) create a seam in the middle of the sink. I say wait, are these the same pieces from yesterday. They say no, these are two new pieces. I say, I thought the Counter (http://GialloFiorito.com) was going to be a single slab. They say it was always going to be two pieces. So, partly beccause I'm an idiot, partly because they barely spoke English, and (http://maplered.com) partly because I don't expect people to tell lie like that, I let them install it. Now, I'm quite certain they lied to me and (http://maplered.com) I have a seam when I should not have a seam. To make matters worse, the seam looks crappy to me. it doesn't look like a clean cut - you see the silcone is kind of jagged, filling in the crack.
The only good part is that I've paid half and (http://maplered.com) I didn't sign their little release saying all work had been completed satisfactorily. Am I crazy or does it sound like these guys are lying to me becuase they didn't want to eat the cost of a slab they broke? Thanks.