Hmmm

I'll be flying from DUB to Texas with BA for my wedding most likely (although AA is looking attractive instead after reading this ,changing at ORD instead of LHR is no big deal) ,it won't be through group sales and as an experienced traveller I know to query the lack of ticket numbers but I'd be livid if BA first messed it up and then claimed they could do nothing to correct it as it's a weekend. Teams that deal with medical repatriations and ships crew reservations work weekends at BA, as many groups are leisure based so are more likely to involve weekend travel it is deeply absurd that there is not even minimal weekend cover for groups even if off shore . BA are a global business not a small family business with limited resources.
If BA choose not to empower their outstations that is understandable but having chosen that stance they need to provide support to those outstations to resolve issues during normal operating times (after all BA don't fly Mon-Fri only , if they did their stance might be more understandable)
As for the delay in refunding and the paltry amount, completely unacceptable. I hope they get a judge who awards a decent amount for time spent and distress. No one wants the abiding memory of their wedding to be how BA screwed things up after all.