We have had 3 different men come out in less than ...

We have had 3 different men come out in less than 6 mo. to fix new heating system and took third man to actually find the problem. Now something not hooked up right for the air condition to work. Will it get fixed by one person or will it take multiple visits like January? It s very inconvenient to wait around to have someone come look at it not once but 4x s. It should take one person and be done.