Airtime loss because of 'paid subscriptions' this is theft!!!!!!

<p>So for the past few months, I noticed that by the 20th or so of each month, all of R200 airtime is depleted. I have a contract that gives R200 p.m. Anyways a week ago I noticed that I had that I lose R10 airtime a day. Why and how? At the time I did not know. Until this morning when I googled the issue and this happened to someone else, where a paid subscription service called vip games had taken airtime from the person. I eventually sms'd stop to a number which I got a response saying that I have unsubscribed from vip games. This baffles me because I DO NOT SUBSCRIBE TO ANY OF THOSE SILLY SPAM TEXT MESSAGES. Vodacom is clearly a spam and unsecured network because I got so many of those messages and I don't even open it I just delete it. So how do I even get subscribed to something even if I don't open the message. So I lost nearly a R1000 maybe more on this non sense. </p>