Unfriendly call centre agents

The SA Post Office call centre staff do not have the patience and kindness to deal with clients that call in. I've been waiting for an International parcel that has arrived in the country more than a month ago. Thus far, I've been calling in to enquire about its status. Instead of kindly informing me that there is a backlog, as previously stated by a different agent, I rudely get told that "it's not in the country yet, we do not know when it will arrive!" This is quite *********** and does not help me much as a customer because I am given different information each time I call in, even worse because it's always in a rude manner.