credit card charges

I received a phone call from woollies offering me with a credit card, I was told by the agent that I needed to collect the credit cared in order for them to activate it and start charging interest. I never collected the card because I am still waiting for my new id now I receive an email from them saying I owe them R200 for what if the card was not even collected from the shop? I phoned them this morning and they told me that the card was activated even though I did not activate it and that was not the agreement with the agent when I spoke to her on the phone please help me because I believe that woollies is *********** people