Worst service!

Worst service ever. Parcel was dispatched from Germany on 12 December and landed in SA on 17 December. Invoiced on 17 December for something not yet received. I have made numerous phone calls starting from the 23 December to TNT to try find out what is the delay. On 7th Jan follow up phone calls were made, where I was send in circles to try and resolve the query. Nobody could answer my query on why the item was still at O.R Thambo International- promises were made to get back to me, which never happened. I am livid. The manager who answered his phone kept on telling me to calm down, as well as he threatened to put down the phone in ear if I don't calm down (I feel that the manager should have not handled the situation in this manner as for it made it worst . The whole situation could have been avoided if there was customer service and feedback was received from the start.