I've been met with that kind of stone walling before too, you know what eventually worked to actually turn the position of a local councilwoman? Going to her office and demand to speak with her, then sitting down, listening and having a conversation with her. Turns out that most of the emails "she" wrote to me was written by an assistant "to save her time" and she weren't aware of the points I was trying to bring up. Granted, this was like one and half decade ago, but if I was met with something similar today I'd try the same thing.

People tend to be a lot more reasonable in person, and also if you listen to them first.