Express shipping fees for snail delivery & poor service!!

I shipped a parcel on the 2nd on November, noticed my shipment is delayed at customs as they need additional details before clearance can continue. Spoke to DHL contact center and export department, Iwas assured that all is in order as I gave them all necessary documentation for customs. I was told my shipment will be released, only to find out the status is still the same on the 4th "Clearance process will continue once additional details are provided for clearance" no one is able to give me answers. My businesses reputation is getting damaged as I cannot even explain to angry clients what is going on, when will this shipment move? This is not the 1st time, the last time I used your service my shipment was delayed in China for 3 weeks and your finance department was on my case demanding payment or legal action will be taken. I guess I made a huge mistake shipping with DHL, history is repeating itself. I'm charged express shipping fee's for SA Post Office snail delivery and 0 customer service. Very disappointing, switching to a reliable courier.