Happened to me, had to go to office last week and ask then what's wrong, what you haven't processed the registration?
They guy in counter asked me to visit the some BUTT SHAB and ask him what's wrong. When I went there and told him that it's been almost a month I have not received file card or plates for my car he said, the file was waiting for approval, which he have approved now and I will get the card, file and plates in 3 weeks.
I tired my best to follow the rules and not to use any references or bribe anyone, but I think these people will never work unless there is any (extra money) in it for them.