08.01. MUC-LHR-MIA

Good evening gents,

so i had a curious case today with BA and i was not able to reach anyone who could advise me on requesting compensation and inform me what happened, herein the story:

I was on a connecting flight with BA from MUC-LHR on the 08.01. scheduled to depart 1045 local time. Unfortunately there was almost a 1,5hr delay due to snow though the flight attendant had a list of passengers that would not make their connection and i was not on that list, so far so good.

Upon arrival i rushed to Terminal 3 being delayed by painfully slow and intense security, having a mile jog to the final gate which was still open and received passengers. The flight to MIA was delayed by an hour as well.

Once the lady at the counter scanned my boarding pass it gave a red signal and upon my inquiry if i my seat was changed she denied. After calling her manager they found that i was not registered on this flight although i had the correct boarding pass.

Forward to me approaching customer service they further mentioned according to the computer system i was booked on LHR-MIA at 0900am London time which is obviously impossible. She could not find any reason for it and i was given a Hotel voucher and rebooked to the morning flight a day later.

Additional:
The checkin lady in MUC upon my request for emergency seat advised me that economy was fully booked or overbooked and i had good chances to being opped up due to my sapphire status.
She did change my seat to a middle row bassinet seat on the upper deck which was the best option at the time.

Might the lady in MUC have screwed up?
Was there a serious computer glitch?

As far as i gathered i would be eligible to receive 600€ compensation. Appreciate your advise if this is correct and what the correct and most efficient course of action would be.

Many thanks,
Greg