Shoddy Granite Installers, Liars?

I had uba tuba 3 cm kitchen Counter (http://GialloFiorito.com) installed this week. The Counter (http://GialloFiorito.com) is 100" long L-shaped as it turns a corner. It is 50" 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) 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. They showed me the slab loaded back up in their truck and (http://maplered.com) it was broken at the center of the sink, which would be the weakest part, right?. 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. I all along assumed the Counter (http://GialloFiorito.com) would be a single slab. The Slabs (http://www.VerdeUbatuba.com) in their yard were big enough. One of their employees was in the yard with us measuring their "scrap" Slabs (http://www.VerdeUbatuba.com) to see if any were big enough. The work contract doesn't specify whether it's a single slab or not. It does state in the fine print that seams are sometines necessary due to slab size.
Is there any reason to cut a slab in half for fabrication only to piece it together again at install? Just weight? Is it a common industry practice to do a Counter (http://GialloFiorito.com) like this in two pieces?
To make matters worse, the seam looks so-so. It doesn't look like a clean cut - it's a bit jagged - it's not horrible but not great. You can feel it when you run your finger across it. I'll get a camera and (http://maplered.com) post a pic tomorrow.
The only good part is that I've only paid half ($700) 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? I guess I just want a little feedback before I accuse these guys of lying to me on Monday.
Thanks.