Money taken off my Private Client cheque a/c

Money was deducted from my account electronically on the 30th of August by a third party who I have bought goods from before. I phoned FNB and cancelled my card immediately and ordered a new one to prevent further deductions. I called the ***** Centre department and was told to complete the cheque and debit card dispute form which I did the following day. I was told that the merchant has 30 days in which to respond and I will be given feedback as to the outcome. I on several occasions yesterday tried getting some feedback with no luck. I was given number after number to call and was put on hold for ages.The amount is R1671.99 which is not small change for me. I can't believe the lack of service and support. It's unacceptable!