Received a text from Xfinity saying they’re sending me to collections

Hi, we cancelled service back in May and have been experiencing issues on and off with supposed bills and charges even though we canceled and returned all

equipment.

I just received a text from Xfinity regarding sending me to Eastern Account Systems Connecticut, a collection agency, for charges.

Can someone please explain if this is legit and if so, why we would be getting charged months after canceling and being told over and over that we have no “legit”

charges from Xfinity customer service post cancellation.