Yes, everyone should pay their bills. No one here is suggesting otherwise. But there are scammers who will contact people at random, demanding they pay a bill that does not exist. No one should pay a bill they don't owe.
Anyone who receives a call demanding payment of a bill should demand that the caller send proof that the bill is owed, in writing, by snail mail. This while not telling the caller their name, social security number, or address. If the bill is legitimate the caller has that information and the bill will arrive soon. If the bill never arrives its fake and does not need to be payed.