This is literally every/any ISP that maintains last-mile infrastructure or anything in between. Cable MSO's are (still it seems) the worst, and having worked for various of them in a network engineering capacity, including @home networks the pioneer of cable modems and service, I've seen it for 25+ years after now first or second hand from others that still do. Eventually it's cheaper to pay a call center agent to take their calls and abuse than fix the actual issue in the ground, which is simply business mantra for the 21st century for anything.
I have pretty good success with a regional provider. I have the option of a national (Verizon) provider, but since switching to fiber on the regional I've had a ~two disconnects, a few minutes of down time in two years. Fiber just seems more reliable.