Inept Service for which DHL International charges a hefty fee

I sent a laptop (which was purchased in South Africa) from Mauritius back to South Africa (under waybill nr ********** 263) and was charged the equivalent of R3200 on 13 November 2017. A month later it has still not been cleared by customs, reason BEING according to DHL International is that their agent in Mauritius did allocate the correct code to it.

Despite several requests they do absolute nothing about it. Promises of attempts to sort it out but nothing happens until I contact them again when they make similar promises again.