State Bank Of India [SBI] — SBI Credit Card maintenance charges - no action taken from sbi customer care

I got SBI credit Card from a person who was selling SBI Credit Card. Only because he told me there will be no maintenance or yearly charges and no charges for withdrawal. Once I got the card from SBI credit card, they started applying yearly charges and withdrawal charges. I asked them many times to close my account and requested to not put. SBI customer care is not taking any action on this. they are putting lot of interest on me. This is affected my CIBIL score. Because of that I am not getting loan from banks.I request here to please help.