********** Credit Card transaction

Saturday night I received a SMS for an amount of R3747 that went off my Credit Card - reference number on my statement shows 070217. Had to stop my credit card and also report it to Absa ***** Department for investigation. How can a credit card transaction go through without the OTP to authorise the transaction.<br> Tried to phone the Customer Services line but to no avail - nobody answers.<br> <br> Will definitely not buy anything on Groupon again with my Credit Card!!!