Account not Debited as instructed

in December I instructed Standard bank through their call centre number to deduct my loan account from the 26th to the 16th. when I checked my updates today no money has been deducted. I called their number and I kept on being transferred. Accounts told me the debit is there but they don't know why it did not go through. i asked them to fix that but they told me to go to the bank to deposit the money. Why should i now leave my place of work and go and join long queues in the branch for something they should have sorted themselves. When i started to make noise about this i got transferred for the 3rd time and got cut off in the process of which i think it was done on purpose . I called again and the lady (Ditshebisho or so) gave me *** and when I followed the instructions the line just went dead, no tone or anything. I'm sick and tired of Standard bank incompetence and their rude call centre agents. Its also surprising that standard bank can change dates to deduct your account without informing the owner like they did in December but if you ask them they don't do it.. i think its time to change banks now