Credit Card ***** not resolved

I reported card ***** on my Nedbank Credit Card on 17 January 2020. Transactions was deducted from my card which I did not authorize / approve via app / Approve It or OTP from IQ OPTIONS. I also received a call on both 14 and 17 January 2020 to approve transactions which I declined. The issue has still not been resolved and I was told by Nedbank that I should resolve the issue with the Merchant. My account is closed with IQ OPTION and I am not receiving any feedback from them. My credit card has now been overdrawn for almost 4 months and it is impacting my credit status and Nedbank is not resolving the issue.