Usual pathetic service from DHL five years on since my first complaint

After waiting 2 weeks for a parcel to arrive from China I called DHL today to find out why the parcel has not been delivered. First they blamed the war in the middle East which is nonsense because I received 3 parcels via Fedex and iMile which were shipped after the DHL parcel from China. Then the person in the customs clearance department said they did not receive the payment for the import costs which was also nonsense because her colleague in the invoicing department confirmed that payment was received. She could not come up with a reason why the parcel is not being delivered and kept sighing and groaning not knowing what to do. When I suggested she contact her supervisor she said all the supervisors are on "DO NOT DISTURB" and therefore she cannot contact them. Absolutely pathetic