Unauthorized Debits.

I received an SMS notifying me of a Debit on my Account for an unknown company to me : RESAHOSTIN/***. Why do unauthorized Debits keep going off on our accounts as your clients, and costs fall on us the Client for the debit and also the reversal. What is Absa doing about this? No one can afford to waste money these days and these unauthorized things are costing us members. Already bank charges are too much , am even considering moving to another bank