If he made a mistake it’s his problem and there’s no reason you are left with paying or leaving as options. If he was honest he would have let you sleep there without asking anything and correct his listing. But what he did was clearly trying to extort you (and you might not be the only one!) best would be to report it to Airbnb right away but since you left and there’s no writing proof Airbnb won’t consider your request 🙁

I would have told him it’s his mistake, the room is payed for the adertised price. No discussion.
A host can’t ask you to leave unless you break a rule (but I would also feel very uncomfortable staying after fighting for the price)

Steve works for airbnb. Every 2 weeks or so the troll ae changes.

We decided to leave early, because our options were to pay an additional 60 Euros or leave. Why should I not ask for a refund for something I paid for and did not receive? I am traveling for a year and 30 Euro is 2 nights accommodation in Mexico where I am now. What is your job title Steve? “Condescending key board warrior, who enjoys being rude to people for no reason”