Xfinity is deceptive about it's equipment rental policy and charges for data you're not able to receive

I have been a Xfinity customer for about five years. During Covid we upgraded to Xfinity's fastest data plan at 1200mbs uploads 45mbs download speed. This spring I found out that the router that I've been renting from Xfinity for $15mo doesn't even reach the speeds I've been paying for this entire time. I decided that I'd just pay for my own router and modem. After paying for my own equipment, Xfinity is now charging me an additional $30 a month to not use their router.