Bad service

I'm qwuite disappointed by the service of dhl staff at Isando,there was a parcel of mine that was not delivered to me and when I'm tracking it shows it was delivered on the 4th of January 2019 and I called them I spoke to consultants and supervisors of which all of them they failed to assist me.I told them that I lost my phone on new year's eve and they claim that the driver called me on my number of which that number was off.So I do not the relevant whom I can launch my query with. There is something fishy here,I lost my parcel and l also did pay duties,I'm very disappointed with their service