The only thing that I have found that works is letting them know that you're recording the call for your own records. Even if you don't really record it, they can never come back and say "didn't you record the last call" without you being able to come back with "A-ha! So you do have a record of the last call where we talked about the bill credit."
There's also a little known credit called a "satisfaction credit." It can range anywhere from $27 to $100.
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