Unauthorised debit orders

Since September 2015 there is a debit order to the amount of R89.00 running on my bank account for which I did not give any authorisation. This is not the first time one of these companies instigate a debit order against my account. All these companies are from KZN. I cannot get hold of any of the numbers I was given by Paythoza to query this debit order and get my money back. Something should be done to prohibit this companies to instate debit orders agains peoples bank accounts.