Axis Bank — issue of 2 credit card while applying for single card

I am having privilege bank account no.[protected] in axis bank. I applied for credit card under neo scheme (Waiveoff card charges). But the axis bank send me card : named as neo and vistara. And now they are asking for the credit card fees on vistara. I appoach the customer care to block my vistara card and waive off the charges because i didnt apply for that card, but they are not responding. Please help.