Parcel is late. Very slow customs clearance. Staff are clueless.

DHL Customs clearance process is very slow. The staff do not know what they are doing. One of their staff told me that there were no duties, but I knew that was impossible so I called again and spoke to someone else who told me that there are duties payable. It then took me multiple calls to get an invoice so I could pay. I then paid and sent through proof yesterday morning. To this moment, their parcel tracking states "Awaiting authorization of/or advance duty payment from customer." This has been a really tiresome process. Don't use DHL if there is urgency or if you want to receive a parcel within their specified estimated delivery time. I will surely never use them again.