State Bank Of India [SBI] — credit card excess bill

Few months ago I used my credit card ([protected]) amount of 56000 and I paid total amount and then after few months I am getting bill 5000+ WITHOUT ANY USAGE.
And every week it's increasing and finally the bill is 7000+ AND sbi agents are making calls and forcing me to make that amount. And many times I am trying to contact sbi credit card customer care but call is forwarding to debit card deportment.
Please do needful for me.