I need to cancel my service but I’m being blocked

I’m trying to cancel my service, but every option they give me in the assistant mysteriously doesn’t work. I can’t chat an agent because of high volume (multiple days in a row across multiple times of the day), I get an error when I try to schedule a callback, and when I try to call customer service directly the system makes me go through all the prompts, wait on hold for 3-5 minutes, then promptly hangs up on me. Why won’t they let me cancel without jumping through these hoops that they make inaccessible?