deducting money without permission

i found out recently there is a debit order going off on my account for R149.00 monthy. for a few months now. i phoned my bank and they gave me this number. ***. i see its an Absa account. i do not have any absa account neither have i given them permission to deduct money from my account. i phoned the number and they said that they cant help me. i want this resolved.