Kotak Mahindra Bank — loan close confirmation and request for noc

Hi

This is sreenivas and my loan account id with kotak is 59628638.
I wanted to close the same pl loan in the month of aug 2018 that is why i submitted dd (Dd no: 899600) for 1 lac 6o thousand changes in the month of aug 29th 2018/ (Additional 600 rs cheque i deposited for extra) and it got cleard in the month of sep 4th 2018. Then also kotak produced my emi on sep 10th. It got bounced because i have already paid my complete loan amount.
When i spoke with customer care people to get noc, they are asking me to pay fine amount from sep 4th to still date. Approximate amount is 2500 rs. Still i dint understand why should i pay additional amount if i already closed my loan last month its self.
Please look into it and provide the noc as soon as possible or else

If you delayed in providing noc, your loan recovery people will kill me like anything. They use to call me more than 10 times including weekend.

Thanks
Sreenivas k