Payment made, but DHL still hasn't confirmed receipt

I'm very disappointed with DHL's handling of shipment ***. It was supposed to be delivered on Monday, but it still has not cleared. We supplied all the requested documentation last Wednesday.

We paid the R3,520 duty amount on 28 October by FNB-to-FNB EFT and emailed DHL the proof of payment. DHL acknowledged receiving it and said the funds would be allocated once they reflected, after which the shipment would be submitted to Customs. Yet on 29 October, we received another alert showing the same amount as outstanding. DHL is now checking with Accounts to confirm receipt.

I am going to DHL's head office today to get confirmation of the payment and a clear update on Customs clearance. Having to chase this in person, despite submitting the documents and payment proof, has been extremely frustrating.