Unauthorised debit order

I just received a notification from my ABSA bank that there was a debit order from 3M. I do not have any subscriptions to any services with them and did not authorise any deductions.<br> <br> Gesk, 18/12/15 SETTLEMENT/C - ACB DEBIET:EKSTRNE, CLUB 3M-238437-1, R-199.00,<br> <br> I want this to be refunded to me as quick as possible as this practice is surely not legal?