Black tie rewards sms

<p>I just received an sms from a company called blacktie rewards advising that they will debit my account an amount of R129 on the 30 October 2016 . I need to know where did they get my account number . Welcome to blacktie rewards, you will be debited R129-00 on the 30-10-16. customer care number is ********** 860 or visit our web www.blacktierewardsvouchers.co.za . I called the number it is ringing </p>