Disrespect and lack of etiquette towards clients

My girlfriend was phoned by DHL and the person calling was incredibly rude and aggressive. When he couldn't verify himself, she said she didn't want to give personal information such as ID number over the phone. When she asked for the waybill number afterwards, he gave more attitude and said "So you want the waybill number yet you won't give me your ID?."

This is absolutely appalling from DHL and the customer service representatives should not be treating their clients so poorly, especially as they should all be aware of the POPI act.