I bought my own router and modem before I signed up for their service as they were the only internet provider in my apartment building at the time. I viewed it as a preemptive measure against bullshit equipment rental fees. Everytime I have had to interact with them since they have tried offer me extra services (none of which I want) for free or reduced price if i would use their shitty box.
Did you get hit with the “no bandwidth cap” if you use their equipment or the $15 a month charge for using your own equipment or a combination thereof? Because that’s their official policy in many places (it’s insanely unethical and barely hidden consumer exploitation of fees).