State Bank Of India [SBI] — excessive extra charges applied on credit bill

Address:

711201

Sbi has issued me credit card telling that for 50 days i will get interest free credit. Now within few days of taking credit i got statement, after failing one payment date, sbi has charged me late payment fee 500/- + payment dishonour fee 350/- + fin charges 477/- + tax 239/- = total 1566/- extra on credit on credit of rs. 13324/- before 40 days, which is almost 11.8% in one month. Home loan or education loan does not take so much interest.