Not all stock ordered was received

Upon collecting an international parcel (Tracking number: EP ********** 53US) from Bountiful Baby, in Salt Lake City, USA via USPS (Total order amounting to R 3000) and going through the box at the Durbanville Post Office, it was immediately noticed that the box was opened. In cross referencing the received items with the invoice attached ( ********** 73) we determine that 6 of the 15 items were NOT accounted for. The first lady who helped us was VERY unhelpful and Unfriendly - to be expected from the post office. The second lady who attempted to assist us was more helpful, Sandra and admittedly confirmed that the SAPO tape was tampered with and cut. She advised us to contact the SA Post Office's call centre ( ********** 502), which wee did with no success as it is a Saturday morning, 21 October 2017. The post master (Paul Jacobs - ********** /2933) will only be available on Monday, 23 October 2017 to follow up. As this is an URGENT matter due to orders that need to be completed and dispatched before the end of this week we are HIGHLY upset and disappointed that this is the service our SA Post Office provides us. We are of the notion to open a case of theft against the post office as this is not acceptable.