Speed Increase charge?

My bill has almost doubled due do to a "speed increase" charge. The speed has been great, but if i remember correctly, this increase was 'included' in the gigabit speeds i was/am currently paying for. I'm looking to adjust my plan (life changing stuff is happening atm) and it turns out this "speed increase" has been charging me $61 on top of the actual plan ($76 + rental fees ($14). 

I have generally been happy about the service i've been receiving, but a "speed increase" of 200 megabytes for $60 compared to the already $90 im paying for gigabit speed seems wildly excessive. I would consider keeping my current plan if I could opt out of my "included" "speed increase". 

Does anyone know how to opt out or cancel? If I were to change plans to a lower speed plan, would i still be recieving a "$61 speed increase"??