dish network billing

Who can I write to at dish network about a billing complaint?
Every time I call these morons I am told that the charges have been removed from my account because I do not owe them. Then a month later I start getting calls from them saying I owe $233. This has been happening over and over since I shut it off in January. Now it has gone to collection! I DON’T OWE THEM ANYTHING! Who can I write a letter to threatening to sue?
For $150.00 you can buy a Free-To_air unit, and have free dishnet forever. No more problems.
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