Hello,
I am not sure if this is the thread I was discussing about an address change my wife had sent via the case specific enquiry to the NDVO last week and we got this reply.
It says and key things to note:
"Thank you for your e-mail informing us that your address has changed. Please be advised that we require the applicant’s signature, or the signature of the applicant’s authorized representative, in order to update the address on a file."
"Kindly note that your current mailing address stands unchanged and your e-mail request has been deleted. The change will only be made after we receive a request signed by the applicant or the authorized representative. We will not confirm receipt of an address change request by mail/ e-mail received at this office but the file will be updated."
"Also note that a change of address submitted to a visa office will NOT be reflected on the online Client Application Status system."
Hope this helps someone