It’s usually the shipper (DHL) responsibility and job to contact consignee for any customs levy, as they are the courier that transacts with the receiving government’s Customs office on all incoming, taxable goods.

Yes, do not expect the local Customs office to make use of DHL’s tracking information, they are just there to monitor all incoming packages, taxable or not.

I find it very surprising for DHL to just wash their hands off this package. Perhaps a message to their CEO is necessary?