AC diagnostic test

Their diagnosis was wrong. Now they say they did not give me a diagnosis. I wouldn't complain if that were true. I paid GMC $166 for labor and I paid $225 for the control module. Now I have to also pay GMC $166 for a diagnostic test because All Pro gave me the wrong diagnosis. I told GMC not to do the diagnostic test because it was done by All Pro. Now I know better. Never trust All Pro Automotive! Not only did they diagnose it wrong and point out the part that needs replacing when I asked what it was, now they deny ever diagnosing it and say it was beyond their ability to properly diagnose. So I just paid over $550 for nothing. Don't trust their word. They are liars.