Payment 'processing'

I am concerned I will lose my flight I app**** for a ticket at 10.18 it is now 14.05 and I still have not had my payment processed through their '*****' system. My flight is at midnight tonight and I am worried I won't get on the flight I need this processed immediately and the helpline keeps telling me it's being processed now. It's been 4 hours What's taking so long I need to confirm this flight immediately No one can tell me how long it will take and I am not getting an alternate paying method so I can get this processed immediately At a loss of what to do