DHL terrible service and lost package

We paid DHL on Tuesday the 21st of April for an overnight delivery which was due to be delivered from Johannesburg to Kimberley with all papers in order on the 22nd of April (medical testing equipment for major mining company), now 10 days later I am told the package is un-deliverable and can't say when it can be expected. So they charged an exuberant amount which I shall report to CCSA which they do not pay back and STOLE the package in essence.