re: How to handle bill from AC service company if nothing was fixed?

I recently had a similar issue on a condo I rent out. The tenant called in May and said the A/C wasn't blowing cold air. I called a repair place, and the girl on the phone said that it probably just needs to be cleaned. A few hours later I get a call from the repair company stating that they changed out the fan, and I owe them $400. A day later my tenant says there is no change in the A/C. This time I meet the repairman out there. He hooks up a device with gauges. He points out that the gauges indicate that it needs to be cleaned. He cleans it, and it immediately starts blowing cold air. I informed them that I would pay for the cleaning but not replacing the fan.

I had ACA come out three times and they only charged me once. Had issue with overflowing and clogging in my central unit. Finally the third pair of techs came out and they knew what they were doing and fixed it once and for all. Called and gave them top remarks. But point is if it's a reputable company those are call backs and they will come out if what they did didn't work.