Another "con" doing the rounds is couriers not delivering parcels. On many occasions they don't even leave a contact number on your phone. They just leave you waiting. You eventually find a contact number and they tell you they couldn't find the address, when normal mail deliveries continue with no problems. They are lying - they haven't been out. Think of the money they are pocketing by not sending someone out.
It is easy for them to tell you to pick it up at the office, but what about the inconvenience and cost of taking a day off work to pick up a parcel? Putting it bluntly - they are stealing! They have already been paid to provide a service, usually by you when you pay for post and packaging.
As long as people accept this and do nothing this con will continue and get worse. Complain through your consumer affairs or fair trading body.