Thuetainers lost cargo and take no responsibility

Goods arrived by ship to Durban harbour and were handed to Thuetainers for them to transport the goods to Cape Town. There were 68 boxes. Only 67 arrived. No one at Thrutainers has any interest what so ever in finding out what has happened or has followed up, or bothered to find out where the box is and how it got lost. When you call the cape town phone number it routs you though to durban as the cape town phone is broken. No one in durban knows what goes on and no one calls back. They have not filed a police report so the box has not been reported as stolen, they have simply lost it. It has now been TWO WEEKS.