Unauthorised debit orders

Good day<br> <br> An unauthorised debit order amounted R99.00 and R350.00 has been deducted from my bank account. The only thing that stated on my account is HDL Trading. I do not have a contact number for this people because I do not know who they are. How can the bank authorise debit orders without the clients consent.<br> <br> I need to know who this people is and where I signed for this debit orders the be deducted from my bank account.<br> <br> I need this money to be returned to my bank account, due to the fact that we budget for food.<br> <br> Can someone please get back to me as soon as possible to sort this out.<br> <br> Regards<br>