Debiting Account without Authorisation

On 03rd December 2015 I received a sms to notify me that my account will be debited on the 14th December 2015. I called the call centre instructed the agent not to change the debit date. I also asked the agent who gave authorisation to process this request he advised me that it was a notification and if you don't want the debit date changed you need to contact them. <br> I believe this is unacceptable service as firstly I never gave anyone authorisation to change my debit date and after calling in and instructing the agent to leave my debit date the same it was NOT done. This morning I received a sms notification to say my account has been debited.<br> How many times is one supposed to call in to change something that was never even requested in the first place?!<br> This is disgusting as now I will have a bad credit record because of African Bank taking money from my account on a date I did NOT grant.<br>