dont force anything man, thats not needed. there's a few options for you which are tricky but you dont need to damage anything.
the first thing you need to do is take off the grill, bit hard with the bonnet down but you should just have enough room to get a screwdriver in there and undo the three bolts holding it.
after that the first thing to try is see if you can get a grip on the bonnet cable with some multi grips and pull on it to release the latch, you should see where the cable runs once the grill is off.
if you cant get it or it still wont open then you can go for the harder way.
for this you'll need some multi grips and a very long (well, it helps if its long) flat head screw driver. you need to unscrew the stiker bolt from the bonnet (the thing that locks into the chassis and holds the bonnet down) using the flat head screwdriver.
to do this you will need to reach under the front bar and get the flat head to reach the bottom of the stiker bolt which has a slit in the bottom of it. whilst unscrewing it use mutli grips to hold and turn the nut at the base of the striker bolt.
it takes a little while but eventually you should get it undone...then the bonnet can be opened as there is nothing left holding it down.