Originally Posted by
mojito25
Under German law "promptly" should be immediatly after knowledge of the mistake. There may be objective circumstances which may delay such "immediate notice". Some courts would take into account that BA operates as well on weekends/bank holidays (i.e. callcenter) and therefore the "immediate notice" was delayed as the "knowledge" is 5 days ago.
Other courts would argue that 2-3 working days (w/o Weekends) in such a big company would be "immediatly", which means today or tomorrow. I would presume that anything what will arrive after Tuesday would be hard to defend for BA.
Just a clarification for the word "promptly" w/o any opinion on the "obvious pricing error". Whoever wants to go to court, I would recommend a court in the east of Germany.
With "promptly" you probably refer to "unverzüglich" as defined in § 121 (1) BGB. Please keep in mind that according to German Courts' interpretation "unverzüglich" allows up to 14 days of consideration and getting legal advice. It depends - of course - on the circumstances of every individual case but in my opinion German courts would probably allow 14 days in this case.