Unauthorized usage / sale of personal data

Vodacom is misusing/selling my personal data as I am getting calls from Call Centres advising they are \authorized\" by Vodacom to contact me. <br> I have continuously requested proof from Vodacom indicating where I consented to my personal data being used/sold. <br> The consultants get very defensive and even aggressive when you do not want to accept the answer that it is \"part of their standard Terms and Conditions\" on their website - and that is sufficient.<br> <br> I am requesting a copy of the agreement where I signed giving Vodacom authorization to use/sell my personal data - in terms of the Consumer Legislation Vodacom has to be able to furnish me with such a copy if they believe they have the right to misuse/sell my personal information. "