Vendors will happily dun your great grandchildren's inlaws.
I canceled a gym membership once. Their collection agents (at least the poor slobs that ended up with my contract at probably 30 cents on the dollar) called me for roughly two years. And I'm talking every. . . . fucking . . . . day. I eventually developed something akin to Stockholm syndrome. I actually started to feel bad for them.
But here I'm mainly talking about digital vendors. They plug you into their algo and then they can harass you for eternity.