My wife got banned from some service a year or so ago. I asked her if she complained, she said no. I thought to myself, “well, I bet those spam-stats are going to look great this quarter.”
And even if there is a way to complain, unless they take action to reverse the decision it's probably not considered a false positive. And most complaints probably achieve nothing.
I suspect most of these companies have no real idea what their false positive rate is.