Cracked granite

   I just had a granite top installed. I have two cracks on the front of the granite to the sink all the way through and one behind the sink to the back splash. Can this be repaired and will it re-crack. Also have two seams that really are very rough. I notified the the company and they came out and looked then came out and drilled the holes for the faucets never sayiny a word. I wasn't home and the job is in a casita that doesn't have access from the house so they come and go sometimes without me noticing.