You can't. They decide not to ship DHL as paid for and they will refer you to DHL even though their own records show they had not even actually shipped it DHL.
Try:
service@rockauto.com
Take your blood pressure meds before attempting this. You will need a double dose and whatever headache remedy you prefer. Whiskey worked for me.

You can't. You can leave a callback number with the business, but they will not return your call. If you have a existing order number you may be able to get a response from them via email.

Whare is my package. An $85 inside door panal. Part # 4029357733. Ca ordered 12/22/16 rock auto had no problem taking my money but apparently don't know how to make a shipment. Pissed