Nedbank - Up to no good .... again

After my complaint regarding debit orders deducted after cancellation thereof on 25/03/2015, a refund was received and all problems resolved. Until May. Nedbank is again deducting monies from my bank account!<br> <br> Who does one contact when these things happen?<br> How long can a refund take?<br> What should consumers do regarding bills and living expenses in the interim?<br> How can I know when it will happen again?<br> <br> Surely a bank should be more organized!<br> <br>