Please explain exactly what this means. Absent explanation to the contrary, I'll assume it means that Verizon made a report to one or more of the credit reporting agencies that you owe it some amount of money.
That's absurd.
As of when? What is your current credit score?
Not entirely sure who "they" are (you seem to be using "they" to refer to different persons/entities or groups of persons/entities). Also, the notion that a single unpaid debt of $80 could "ruin someone" is absurd.
If the debt is owed, no.
You haven't articulated any valid legal claim. You haven't asserted that the debt is not valid. In any event, you'd spend upwards of 100-200x the amount of the debt to sue, and you'd have no guarantee of succeeding. If you pay the $80, any negative impact it had on your credit will be gone in relatively short order. The bigger harm to your credit came from 15 years of "not need[ing] [and presumably not using] credit."

