I have been holding a booking for 72 hours on BA website and payed 10 euros for this.
Now I am trying to pay my booking but BA website keeps saying (after confirming the payment with my debit card) :

"Booking error
A system error was encountered during the confirmation, or return of your booking.
Please try again later."

I have tried with several debit cards and even with PayPal. Same result.
Problem is my booking will expire in 1h now, and nobody at BA can answer since their contact service is closed.
What should I do ? If I loose this booking, a new booking will cost me about 4 times more.