Cannot Get offside or nearside Mirrors Off Audi TT Mk2 2012

I have been trying to get the mirrors off but they seem to be stuck have removed the securing bolt which should allow it to be removed but it will not come off, the instructions remove retaining screw rotate mirror forward and pull up but it seem to be stuck .

Looked at U-tube videos looks so simple but will not work for me, the one side the screw has been drilled out and another screw has be fitted but second screw has lost its head so needs to be drilled out on that side.

Have the Audi service manual it tell you to just remove screw 6 (located in the metal that rotates the mirror) rotate forward and pull up to remove mirror housing I have used WD 40 on the components that move but no luck tried to Removing:   Instructions from manual :-
Take out
mirror glass
prior to
removal.
Removing:
– Unplug
electrical
connectors
for mirror
motor and
mirror
heating.
– Tilt mirror
forwards as
far as it will
go.
– Unscrew bolt
-6- at mirror
base.
– Lift housing
off mirror
base.

Some u-Tube say or show you just remove mirror takeout screw 6 turn forward and pull up off mirror base. Can anyone please advise.