I would like to let everyone know, that as much as they screwed up on the rebooking, BA handled the complaint very professional.
Within 24h of my complaint I got a call to excuse for the mess, ask for my details for my EU261 compensation and offer me a one way upgrade voucher valid for a year.
Unfortunately they didn't know why things happened and I pointed out again the closed ticketing desk and the problems involved.
Thank you guys for the input and listening.
Can I change the title of the thread in well compensated 🤔