State Bank Of India [SBI] — card blocked due to 1 missed payment

Address: Kolkata, West Bengal, 700040

I have been using sbi credit card since last 1 yr.
I have never had this issue
I missed my payment in march 2018 and the bill which got generated in april 21st and its due date was 10th may and the bill was rs 14750.
I never use to check my bill and may my bills instead
I made a payment of 10000 on 12th may and on 22nd may i got a message from sbi that i have to make a full amount of total outstanding amount of rs 59000.
I always use to pay the minimum amount and also 10k which i paid i dont know what happen to that.
Now another thing is when m checking my online sbi portal i can see i have to pay on rs 4461 and alsoin ivr also its telling me the same.
I use to get many calls from different ppl fromdifferent number but non of them told me that my card will be blocked if i dont oay such amount.
There was a guy floor manager deepak kumar he told me my payment will be change into settlement but today morning i got a mssage that it cannot be done in my favour.
I really want help or else i wil lcommit suicide and i will make sure that sbi suffers