Charged for a card I do not have - no response from Nedbank

I noticed last week when going through my garage card statements online that I am being charged an additional card fee. I only have one card. I sent a secure online message on the banking system with no response. I phone the customer service line on Tuesday, 10 March 2020 and was told they only see one card on my name and they will get a supervisor to contact me. It is 2 days later and I am still waiting. Why am I paying for something I do not have? How many times has this happened and what else am I paying for that I am not aware off? Shocking