Bankruptcy

I filed back in October for Chapter 7 and Xfinity is the ONLY company that continues to harass, ask for money and send notices threatening disconnection. I have been on this phone for hours at this point and I'm mentally exhausted with the lack of knowledge and getting the run around. I need someone that knows what they're doing to see why out of all the creditors, this company is the ONLY ONE to not take care of this past due balance? All paperwork was mailed or electronically sent.