REFUSES TO PAY FOR WORK COMPLETED

MY COMPANY DESIGNED, MANUFATURED AND INSTALLED SOME WALLART FOR CLEARDATA'S OFFICES. WE NORMALLY DO NOT DO 50% DEPOSITS PURELY BECAUSE THIS IS WHAT HAPPENS. GIANMARCO LORENZI APPROVED EVERYTHING (I HAVE IT ALL IN WRITING) WE INSTALLED THE ARTWORK AND HE NOW IS REFUSING POINTBLANK TO EVEN TALK TO US OR REPLY TO OUR EMAILS. I HAVE SPOKE TO A NUMBER OF OTHER SUPLIERS WHO HAVE TOLD ME THIS IS HOW HE OPERATES. HE STIL OWES OUR COMPNAY OVER R6000, KEEPS PROMISING VIA HIS STAFF IT WILL BE PAID BUT TO DATE WE HAVE HAD NOTHING, NOT EVEN AN EMAIL.