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There are a few ways, try the screw driver. Find out where it snapped of, at the T or before the box.
If it before the box, you can open from the broken cable with the plier. You need to remove the wheel well I think http://www.dognmonkey.com/audi/how-t...ble-broke.html
Take some pictures.
Cheers and good luck,
Louis
OP, if Louis's reply and link doesn't provide the solution...
Here is a short graphical how-to on using this forum's advanced search which can seem not so intuitive to forum newcomers.
I specifically used keywords from OP's title to find a long thread covering several strategies for opening the hood after a cable break in a variety of locations along the hood opening mechanism (that thread also includes tips for preventative maintenance).
I recommend reading the entire thread to ensure you pick the ideal method for your cable break situation (thread link included after the advanced search how-to screenshots):