Nedbank dismisses case of ***** on my credit card

On 24/12/2014 @ 07H04 I received an sms stating that US$97.00 had been deducted by SLIM QUICK GARCI. As I hadn't used my card for this, I immediately phoned Card Division to report the ***** and to cancel my card. Card was cancelled BUT ***** said I didn't have a case & had to complete a Disputes Department Voucher which I did REF 979409. I was told to complain to the Supplier in writing and then resubmit my Dispute (05/02/15) BUT the very next day I received an email saying INVALID DISPUTE!!! I will NOT accept this and be forced to pay for someone else's *****. Also by processing the ********** transaction MY ACCOUNT WAS PUT INTO OVERDRAFT!! Why can ABSA bank implement means by which ALL transactions can only be processed once the account holder has sent a OTP confirming it but Nedbank cannot?? How can I be told that this is an INVALID DISPUTE after I immediately reported it and cancelled my card? Now I have the Call Centre continuously phoning me for payment and I haven't even collected my new Credit Card because I can't afford anymore ********** transactions. PLEASE SORT THIS OUT URGENTLY!!