My parcel was marked as Delivered by DHL, but it was not - I was home, they did not come. Contacted Alibaba - they say they need info from DHL before proceedin

My parcel was marked as Delivered by DHL, but it was not - I was home, they did not come. Contacted Alibaba - they say they need info from DHL before proceeding with a refund. Contacted DHL - they say they will only communicate about getting that info with the sender, Alibaba. Bastards.