I'm facing a similar situation with a local ISP/fiber company, but on a much smaller scale. Their TV service is buggy to the extent that it barely works, with massive quantities of glitching and freezing. Their support has admitted that the problem is their side, their TV department is understaffed and it probably won't get better any time soon.
Unfortunately, I am currently in the first part of a yearly contract fully pre-paid. This is because I didn't really anticipate that a real, legitimate company that maintains significant infrastructure might simply shrug and say, well, our shit doesn't work so suck on it. I filed for cancellation and requested a rebate after trying to get them to fix things for several months but they flatly denied it and claimed that in fact, their TV service is "free" and not actually included in the (internet) contract at all. They've also written the TV T&Cs in such a way that they literally say the entire service might not work at all for indefinite periods or forever, and you have no recourse.
This strikes me as complete horsecrap and after checking my local laws, I'm pretty sure they're in violation of several aspects of warranty and agreement law. Next step is to get legal advice. The laws in question boil down to:
1. You may not disclaim all liability/warrantee rights, regardless of what you put in your contract.
2. Consumer agreements that are totally one sided aren't valid.
I don't know if there are any equivalents for B2B contracts, but this sort of rule is pretty common around the world. You can't actually be completely negligent when selling things, even if you get people to theoretically sign away their rights.
After encountering this nightmarish customer support I googled around a bit and wasn't hugely surprised to discover their staff flaming customers on Twitter and claiming they (the customer) were guilty of "hate speech". Not really amazed to find a correlation between those sorts of beliefs and crap, unprofessional service. Wish I'd known about it before.