Deducting Monies without permission!

A few months back I saw R350 had been deducted off my account. I saw it was HDL Trading and at the time I thought it was strange, reversed the debit order and forgot about it again.<br> The past 3 months now I keep getting HDL Trading where they take R99 off my account every month! I have contact them and I am for sure not happy about this!<br> They have NO permission from me or anyone else to just deduct money left, right and centre.<br>