DEBIT ORDER HEADACHE

First I would like to say that I am a very proud FNB account holder. It is the most convenient bank for me. But now about a month ago I noticed a debit order with reference "EazyDebit", I don't know this company or who they are debiting my account on behalf of. Therefore I reversed the money via cellphone banking, received sms and calls from FNB regarding this debit order and finaly spoke to an FNB call center consultant who stopped the debit order. Upon checking my statement I realized that I was charged R55.00 for stopping this debit and it did not bother me much because I thought at least they wont debit anymore. Unfortunately, this month again the debited and when I queried the debit I was told it went through because they used a different reference and there is nothing FNB can do; I just have to cancel my contract with these people, and my question is who are they? I know all my creditors and EazyDebit is not one of them , so what am I going to cancel there. I was given their number but when I call them there is no answer by their offices. I need this debit order stopped, I don't have the time to keep reversing this payment and be continuously charged for reserving it. I do not want to change my bank over this, can someone help me.