The voters elected a Republican government. That a Republican-led FCC would err on the side of under-regulating telecommunications companies is about the least surprising outcome you can imagine. Anybody who told you that lobbying the FCC was going to make a difference here was, whether they meant to or not, selling a bill of goods.
As someone who respects but mostly profoundly disagrees with principled Republican laissez-faire regulatory strategy (at least, once we got past 1991 or so), it is more than a little aggravating to see us as a community winding ourselves in knots over market-based regulation of telecom at the same time as the (largely unprincipled) Republican congress is putting the finishing strokes --- literally in ball-point pen --- on a catastrophically stupid tax bill that threatens universal access to health insurance, not just for those dependent on Medicare but on startup founders as well.
If you care deeply about this issue, stop pretending like filling out forms and putting banners ads is going to persuade Republican regulators to act like Democrats. "Net Neutrality" isn't my personal issue --- I worked at ISPs, have backbone engineer friends, and candidly: I think this issue is silly. But if it's yours... sigh... fine.
But do it right: get out there, to your nearest seriously threatened D districts or to the nearest plausibly flippable R district (the suburbs are great for this), open up your damn wallets, and donate.
The FCC may very well be right that it's not their job to impose our dream portfolio of rules on Verizon (certainly, a lot of the rules people are claiming NN provided were fanciful). It doesn't matter how dreamlike the rules are: Congress can almost certainly enact a law, which the FCC can't revoke.
But otherwise, be clear-eyed: elections have consequences. We elected the party of deregulation. Take the bad with whatever the good is, and work to flip the House back.