Cannot cancel NOW internet service

I've been trying to cancel my NOW internet service for two days and it seems to be the unsolvable problem for Xfinity. I've talked with multiple customer service agents and nobody can successfully cancel it. I'm unable to cancel it myself from my account page because I've been getting a "There's been an error. Try again later" message every single time I try for the last 48+ hours. 

I'm at a loss for what to do and Xfinity can't even seem to solve the problem and I'm stuck paying for a service I can't even use because I get the same error message when I try turning off auto-pay.