Lendplus complaint

There is this company called Lendplus who has been calling me non-stop that claims I have outstanding debt with them. Not sure how they got my cellphone number and ID number. They are sending threatening messages and I would like to warn people abput tgis company and will report them to the credit bureau of South Africa because they are probably doing this to other people/consimers too. They've even listed me on Credit Bureau and my score has dropped a massive 10points.