Spam and Content subscriptions

<p>My mother-in-law is constantly receiving SMS from spammers and ********. </p> <p>She upgraded her a phone about 3 weeks ago and has now been sent a message:</p> <p>Confirm your request for Smartphone S7 and R7/day new SIM R7.00 per day. Reply "Yes" to confirm/"No" to cancel,free SMS.</p> <p>Now she has obviously never requested this nonsense, so why is she receiving this? </p> <p>How do I stop this? The information on the My Vodacom site shows us how to View Content Services but her account does not show this option yet clearly she has this issue.</p> <p>Vodacom we expect a solution for this! We know You along with other companies sell our details... so yes this is your problem.</p>