Unauthorised debit order

On the 1st of April 2016 I received via sms a notification of a debit order that went through. To my knowledge I haven't signed any debit order nor did I give Absa permission for any debit orders. Upon my arrival the lady referred me to the tellers and not the enquiry section. After waiting about an hour in line the lady said she couldn't help me and refused to take any other identification of me. She suggested that I go take a bank statement, AT MY COST, to see why it went through. This is unacceptable! I'm done waiting in your ques and then receive such service. I've had that account for over 10 years and this is how you treat your clients. I'll be closing my account as soon as Absa sort this out!!!!