Not receiving remaining data SMS notifications

<p>What a perfect way to squeeze some extra money out of your customers.</p> <p>Vodacom has now caused unplanned use of about R100 to R150 of my airtime as they did not send me a sms notification as they state they are supposed to do on their website :<br /><br /></p> <p>http://www.vodacom.co.za/vodacom/services/data/concerned-about-your-data-usage</p> <p> </p> <p>Please advise a way foreward to get my airtime refunded ???</p>