Can’t cancel Hulu

I signed up for Hulu through my xfinity box. Subsequently we cancelled TV service and turned the box in but retained xfinity internet. I now want to cancel Hulu. Hulu says Comcast has to cancel it; Comcast says Hulu has to cancel it. I’ve spent hours on the phone with representatives from both companies who are pointing the finger at each other, and I’m stuck paying for a service I don’t use. Please help.