Can you see the dipstick tube where it enters the block??

Sometimes these have a shoulder swaged onto them (some cars, dont know about
Jetta), and they are tapped into the block.

If it is like this, simply pulling on the tube is likely to get you nothing
but a bent
or broken tube.  In those cases, you have to get under the shoulder and pry
the tube out of the block, gently.

Others may have o-ring seals at the tube-block bore interface which control
leaks,
and then there is a separate flange welded to the tube which gives a bolting
surface
to some area of the block.  In those cases, unbolt the flange and gently
remove the
tube.

As I said above, I have no idea if this is the way Jetta works, but have a
look
if you can get in there to see what is going on.