I contacted my legislators about this a couple of times (maybe more?) first by email and then by phone. This was before Pai did the inevitable.
The staff who answered the call were variable in how aware they seemed to be about net neutrality. Some of them seemed to know what I was talking about, and others seemed clueless.
At the time, maybe a week or two later, I got a typical kind of response. I wouldn't say it was canned, but maybe something like that, explaining their position and so forth, which I knew. I've received many of these types of responses over the years on various issues (I'm not saying all the responses I've received have been like this, but a lot of them have been).
The thing that's strange is that the last couple of days, about the time the dems managed to gather their 50 votes, I started getting these emails from some of the same legislators explaining that they were crafting a response. These were legislators that already replied to me, a couple of months ago or so, and the vibe I got was that they wanted to reapproach the issue or something. I've received one of these letters, and the overall position hasn't changed, but it was more detailed and a little more defensive or something.
I'm not sure what's going on, but my gut impression is that the GOP legislators here are realizing they're on the minority end of this issue with regard to public opinion, and are trying to reapproach voters with a different PR spin, trying to do damage control and a "do-over" on an issue they weren't paying too much attention to before. They seem a little nervous about their position to me, even if they haven't changed it formally.
What means did you use to share your concern? AFAIK there's a reason a phone call is recommended: letters barely matter, and emails/electronic form submissions are basically equivalent to not sent.
