Originally Posted by Tenere

so far, most of those ultra-super-cheap error fares in business class were canceled within couple of days! Not this time due to the fact that there was more priority given to the other millions of passengers affected by Corona virus.

A simple correction (e.g. charging all bookings just the missing amount) is legally not possible (you have agreed to be charged as shown during booking any other amount would need your newly acceptance. Usually lawyers say that there should be 14 days taken as period when airline need to cancel and dispute against the fare. They didn't!

A correction of the fare at checkin/airport desk is possible in theory but actually it's to late to dispute a error-fare only at checkin. There are some reports in denied boarding with error fares but unclear backround (double booking on same name etc.)