Poor Customer Servise after sale

THIS IS A ELECTRIC SERVICE CO. THE GUY WHO INSTALLED OUR DYNO FOR DOING SMOG REFFERED THIS GUY TO INSTALL 220 V CONNETION ALONG WITH WITH AIR SUPPLY TO MACHINE. THEY PERFORM THE JOB & AFTER WE START THE MACHINE THE AIR START LEAKING. WE CALL THEM THEY SHOW UP AFTER TWO DAYS,FIX THE PROBLEM,BUT WHEN THEY LEFT THE LEAK START AGAIN. THE REASON FOR LEAK IS THEY USE SUB STANDARD PRODUCTS. WE ARE LOSING POWER IN COMPRESSER BECAUSE IT KEEPS RUNNING 24 HOURS. ONE COMPRESSER IS MESSED UP. WE PUT ANOTHER ONE. NOW WE ARE CALLING THEM EVERY DAY TO FIX THE PROBLEM, THEY DONOT ANSWER THE PHONE.