Very disappointed in the way my parcel has not yet been delivered after DHL made a mistake on their side without informing me of the issue

After multiple phonecalls, emails and enquiries. I have struggled to get any answers or solutions from DHL South Africa after they have made a mistake on their side. I was not informed or told why my shipment is till this day more than two weeks late. I am payinh lots of extra costs to ensure my shipment is arriving before I leave for holiday, yet everyday I phone I hear the same thing. The issue also states that there was a mistake made on their side in terms of the amount of billing fees which were supposed to be paid. I will not cooperate and pay the excess of the money for they could not even let me know of the issue, yet just ignored it. I would appreciate if they could give me a plan of action so that I am informed. This is also not the first time this has happened.