Looking for my sublings from my fathers side

My name is Ndzinisa Colani from Qomintaba Swaziland, im looking for my sublings from my father’s side who left Swaziland with their mother to stay in South Africa. Their names are Bongani, Maniki, Sithembile and Sibusiso. They all either use the Ndwandwe or Nxumalo surname from their mothers side, they last visited Swaziland in 2008 and I suspect they are all working now. If you have any information concerning how I could find them please contact +2687665819. Thanks