Poor customer service

Hi there I've been banking with Ned Bank for quite some years but this year I soo disappointed by NED BANK I went to mount frere branch for replacement of my savings account that they charged it to current account without my consent surprisingly I received an sms from Ned Bank about my overdrawn account I phone to enquir they say there was a transaction of R179 on my account on the 25 of October of which I never received incontact for that .... my question is what happen to my incontact and why they change my account to current account without even asking me or being transparency because this is my account