Yeah, same here. I find it extremely dishonest to advertise as "no hidden fees" and then get nearly ~25% of extra fees tagged on.
I don't own a landline phone, I don't want to own a landline phone - even my cell phone is permanently on silent, because of all the robocalls. It is technically possible for Sonic to verify that a phone has never been attached to this line (since it's VOIP after all), so charging extra taxes makes no sense. I wonder if it's even legal, considering they didn't actually provide phone service at any point, just the OPTION of getting phone service.
If the cost of running the service without doesn't make sense at $50 a month, just make it $56 then, I'd pay that and wouldn't feel ripped off (plus I wouldn't end up being charged ANOTHER $6 taxes for something I don't use). This is not nickles and dimes either, it's 25% more than advertised out of which 12.5% is just pure profit margin for Sonic.