Appalling service from DHL

I booked an international shipment with DHL Express from Belgium to South Africa. I made payment on the 21st March 2019 and immediately sent the payment details together with a form that I had to complete to the DHL consultant. He contacted on the 25th and apologized that he was off sick. I have been calling DHL to ask my shipment has not delivered. On Wednesday, a consultant kept me on hold for 30 minutes and I dropped the call. I called again on Thursday, I was helped by a gentleman who promised to call me on Friday at 11am that didn’t happen. On Friday I called spoke to a consultant who told me the delivery address was incorrect and the tracking number that I have on email from DHL was not correct. I told the consultant that it’s impossible as I have completed a form with the correct details including my contact number. I asked why I wasn’t told when I called or contacted by DHL she could not give me an answer. She then sent me a mail that I should respond to with a correct address, I did. As the shipment is urgent hence I chose DHL it will be delivered today first thing this morning. The shipment is still not delivered. DHL does not come cheap. I paid R806 for a card to be couriered to SA urgently. I should have gone to SAPO paid less than paid this much and wait. I sent a email to DHL to complain about the service on Wednesday, I am yet to receive a response. DHL has become useless.