Using Personal Information

Received a call from Calvyn from *** claiming to be from Mongo working for Telkom/Vodacom. He used personal information, which only my service provider(none of the above) will have. <br> <br> Where did they get the information from? This is harassment. This is against the law if i'm not mistaken. <br> <br> Very convenient that they phone me now when my contract is about to expire.<br> <br> Please leave me alone