Explain how I am charged for notify me , if the account is not registered to receive notification

I have been having a number of problems lately getting my ORP numbers on online purchases. When I called the lady told me that a digit on my cell number does not match with what's on the system. Now I ask when was that changed because I received OTP's before no problem. She can't tell me I must go to the branch and fix it. Yesterday I go onto my internet banking and see that my true save account has a R1.20 charge for Notification sent. That account those not have notify me loaded on it. I want to know, is there a problem with Absa's system or is someone trying to do ***** on accounts and see if clients notice it?