Valentina O'Gara you was lucky they even accepted 500k of the 1 million. Some I/O won't accept joint accounts period. Those that do will look at it, as in your case that only 50% of the balance is yours.
From how I understand it, the system won't allow you to make an appointment booking for the next 10 days. Basically, your banned from using the system for 10 days.
Next available slot for a Tourist visa showing as Friday 3rd May, then nothing until 8th May. Notice they now impose a 10 day suspension if you cancel a booking