Unauthorised debit to my account

My account at FNB is being debited with an amount of R56.00 which I have not authorised. <br> Hollard claims they have no record of this transaction - however my bank insits that the stop order is being generated at Hollard.<br> I have had no success with my queries to Hollard. Although you can cancel the last payment that went through your account, they only need to change the reference on the stop order and re-submit the debit for payment.<br> <br> <br> <br> <br> <br> <br>