BB Brown Bread with black stains in bread

I purchased 2 loaves of bread from my local convenience store last night 11 June 2015 approximately 18h45.<br> Upon opening the packet (Dated best before 15 Jun 2015 18:26 - Production BDU161P25) to prepare my daily lunch I noticed a strange black marking in the bread, and with further inspection of both loaves, it looks like the dough has been mixed with a black substance that baked into the bread. Not sure of what this could be I don't want to risk my families health. With calls to the customer support which was extremely frustrating as they were not professional at all to listen to my complaint. I would now like to know where do we go from here.