Not everyone has the luxury of having a spare two hundred dollars to throw down the rabbit hole. Absolutely do not pay it without calling them first to clarify that it wasn’t sent in error.
Personally I feel no ethical responsibility to pay bills. If they were threatening to send you to collections, that’s a whole different ball of wax. But they aren’t at this stage. Don’t shell out!
Rand, give me your address so I can send you a bill. I already know you’ll pay without going through the hassle of disputing it. gimme!