problem with deep well and check valve

We have a deep well. A few months ago we started having problems with it. We got a well company (that I have used before) to come out. The replaced the tank (leaking diaphragm) and put a check valve near the well. There is a metal pipe coming from the well and going to the house and a PVC pipe that comes up and branches. One branch goes to the metal pipe and the other goes to a spiquet (sp?). They put the check valve in the PVC pipe (and after that the spiquet would not work). I paid the bill promptly.
But we were still getting air in the line so I called them back. This time they determined that there was a leak in the drop pipe in the well and replaced it. That fixed the problem and I promptly paid that bill.
Sometime after that we noticed that the PVC pipe was leaking where they put in the check valve. I called them back and they took out the check valve. Today I got a bill for that visit, saying that the check valve was bad and I "don't need it now".
If I don't need the check valve now, did I need it when they put it in? The only thing that has changed since then is that they replaced the drop pipe in the well.
From my perspective, it seems like they charged me to put in a part I didn't need, which turned out to be defective, and they want to charge me again to take it back out.
I called them about 4PM today and asked. The person said that he understood what I was saying and would get back to me (but so far he hasn't).
Does this check valve issue make sense? Am I right?
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If they are a reasonable company that warrantees their work, then all will be forgiven. If they are not a reliable company and try to pad bills by doing unnecessary work (which they don't stand behind) then it will be a cat fight. Could be that someone is trying to cover up their mistake and using you (and your money) as the fall guy. MLD
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They show to fix a problem they caused and want to charge for it!!! s to the checkvalve. In a well installed system, that check valve is not needed. When I see one between the well and the pressure tank I suspect a "ham handed" fix of a problem rather than fixing the real problem.
Harry K
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On Thu, 3 Nov 2011 19:10:49 -0700 (PDT), Harry K

This company installed the well approximately 14 years ago. I don't know what problem the check valve was to solve, but the system didn't "need" it until a few months ago.
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