I have contacted the Angolan Embassy in Dubai and they advised that I should apply in person in Angola.
Do you think if I attach this email it will be considered as a true attempt?
http://www.cic.gc.ca/english/information/security/police-cert/africa/angola.asp
They say you should approach the local police authority for a PCC. This is the first time I've seen a country where it doesn't give any advice for getting one remotely.
Can you contact the local police authority by phone or e-mail and ask them how one can be issued? Try to get them on the record such as by e-mail or fax saying they won't issue one to you remotely.
If you really CANNOT get one, explain this to the local VO and see what they say about it, but at least you should make a genuine attempt to get one first and preferably be able to provide documentation that you made the attempt.