Canara Bank — education loan closing issue

Borrowed education loan for the period of[protected] in canara bank & i have asked to attend ots (One time settlement) meeting at reginal office.

Finalized the settlement amount during meeting & asked me to pay the confirmation amount initially and given 1 month grace period to pay the remaining amount. Finally paid (Jan 2016) in my bank on the date mentioned during ots (One time settlement) meeting & submitted the letter provided from the regional office.

Went to my bank several times & asked noc to the manager. Got reply as "still we didn't get any confirmation from the head office & will inform you once got". But manager didn't inform yet though mailed.

So, i went to the bank recently few months back & inquired again, the new manager checked the details and informed as "still it is not closed so you have to pay the whole amount again". I said i have closed the loan via ots (One time settlement) before one year itself. Again he checked the proof of ots (One time settlement) details which i submitted before a year & asked to pay 5, 000 to 10, 000 rupees for idle account, then will initiate as second time payment & close.

What shall i do next? Shall i complaint to rbi directly???
I'm totally blank & don't know why still they have not closed and asking to pay again 5, 000 to 10, 000 rupees?