DHL customer service is unprofessional

My parcel was scheduled to be delivered on the 5th of October 2020 but never received it. I called DHL on the 8th and spoke to Ntombizodwa and she advised that i need to fill an ITAC form which she then emailed to me. Mind you no-one had called me to inform me about this, I had to follow up. Now here is the disappointing and frustrating part, i filled in the form and sent to the email that DHL provided and i kept getting undelivered notice to all 5 emails that DHL provided. I went to their offices at OR Tambo and they did not assist me with any new working contacts, Tracey ( supervisor ) got my contact details and i am yet to hear from her. We pay for these services and yet we do not get our parcels. I have sent them an email for my account to be handed over, i am still waiting for their response.. This is totally unprofessional. Can someone from DHL assist urgently