Unable to progress campaign stuck screwed

[crispykiller96]

Ok so i got to the end of the opera house near the end of the game then. Had my team hack some computer then i was asked to extract to the roof but didnt. See it at the side so went back now all the enemies came back and i cant leave so im screwed took me fucking ages to get to this point on relistic and now i have to restart the campaign way to go ubisoft not fixing such a broken game from all the back in 2006 :-/