Bad service from DHL Express

Shocking service provided for receiving and delivery of a parcel from DHL express that was sent in December from India and still not delivered after the parcel was in their possession since beginning of 2021 . Called and spoke to a number of their customer care staff to follow up on progress , all promised to call back with an update and no call back with updates was received , no results ? Bad reflection on the DHL EXPRESS Management who can not train their staff to provide a quality service they seem advertise they provide , another service provider who cant walk the talk ?