Failed to change my documents from Passport to ID

I was using a passport all along then now I have an ID card. My problem is I am failing to change my details from passport to ID. I went to Germiston Edgars branch and told them my issue. I was told to make copied of my passport and id and they said they would sent it to head office that was in April 2015 and nothing happened. Then I tried again in May at the East-Gate branch I was told again to make copies and up to now nothing has happen. Please could you advice the way forward.