Broadsword Advantage/EFA Processing Refused to pay for voice/data and cabling job Carrollton Texas

We did a voice/cabling project for Bob Boyd - 291 cables for their new building in August 2013.  They paid their down payment to get us to start the job, however, when job was completed, they have refused to pay for remaining balance.  We actually made a physical trip to see Bob Boyd after numberous attempts to contact someone by phone (only to be put directly into voice mail or told we had the wrong department) and he assured us that he would set up a payment plan within 4 days to pay for the services.  He returned our calls once saying he was busy but would call us tomorrow with a plan for payment.  Since then, he will not answer our calls nor return them nor has any attempt to make payment occurred.