Taking my money

Okay so I was called by a Nedbank agent a few months ago about a new offer. It was a new gold cheque bank card (for American express) and Greenbacks card. I told him that I would take up the offer if it was free, he confirmed it was a free offer. A month ago I received the new cards, however they did not work (kept declining) so I could not even use them. Now on the 7th of Aug Nedbank debited my account TWO times for R 185 each, one for an additional card and one for maintenance fee. So I called the client contact centre and one of the agents also told me he does not understand why they billed be as it was free. He said that unfortunately I had to go sort it out at my local branch, he could not sort if out over the phone for me. I went to our local branch and they are closed! I have only ONE bank account for which I pay R 115 pm maintenance fee. I will not pay another R 185 for a new cards maintenance fee, this is ridiculous! I want my money back! Are you taking my money seriously or just taking it? I am very unhappy!!!