I think warning them that Wildfire would be disabled for them on a certain date if they didn't pay/add a link would be more reasonable, but they just threatened

I think warning them that Wildfire would be disabled for them on a certain date if they didn't pay/add a link would be more reasonable, but they just threatened legal action. They didn't even suggest stopping use of it, almost implying that having used it in the past indebted them.