Charged wrong tariff and I had to correct it and now I have to run after them for delivery

I had a parcel coming from japan. It's car parts. First they charged them on a wrong tariff which was for brake parts for heavy vehicle. I looked up the correct tariff code and sent to them I never got a response. On Sunday I called and got Johan and he sent me an email which I rep**** to with the correct tariff code. Then there was no response still. On Tuesday I called and Spoke to Sihle who went to check and called me back to say they've updated the invoice and he'll email me the invoice. No response still. On Wednesday I got hold of some who fortunately sent me the correct invoice. I paid immediately and advised them that I paid. The shipment was released by customs same Wednesday. I was hoping to get a delivery today but still nothing. I called and was told the delivery will be tomorrow. I then asked to collect the parcel from their sorting centre as I have done so many times before. To my shock I was told they need to inform someone who will then get an authorisation letter form their manager and then they will email me. The day is ending and still I haven't heard anything from anyone.

I have used DHL before, when a parcel is released it usually delivered the following day in the morning. Since when did this perfect service change to this ******* service. I need these parts on Tuesday as that's when they were supposed to be delivered and now it's Thursday going to Friday but I'm still no joy. I'm very ****ed off with your service - it's pathetic and even your staff is not helpful.