Thanks Informatics for kind suggestion.
Anyhow I already send the letter to Citizenship
general address PO Box 12000. I did not
write 'Grant of Citizenship' on the envelop,
but did write My application Number on the envelop: C000...
Hope they can still make sense out of it and attach my amendment
to my application file. I simply thought that for all future correspondence
example notifying of amendments etc--po box 12000 is the correct office.
,
and only for strictly sending application one has to send it to po box 7000
with regards,
Godhelp