DHL South Africa - the best at being useless and inefficient

Worst experience I have ever had. My Parcel has been in customs for 1 month now as they needed proof of payment and bank statements. I sent these through to them immediately, it then took 15 working days for them to get back to me to tell me the documents were incorrect. Then my parcel got handed over to someone else in DHL Customs. I re-submitted the documents again, and again it took a further 10 business days for them to let me know that the documents I submitted were again incorrect. I then found that they had not received the 2nd submitted document because the person who was handling my account resigned and no hand over was done. Now Ive had to resubmit the same document I submitted on the 7th of September and have to wait an additional 10 business days for them to confirm if the documents are either correct or not. Since Monday 14 September 2020 I have been emailing and phoning to speak to the people who are dealing with my parcel and not one single person is responding to my email or answering my calls including the customs Manager himself yet the manager will respond to emails sent from the person handling my account of which I have full email traces etc showing this. The service at DHL is the worst customer service I have ever experienced in my life.