New India Assurance — Agency License

I had submitted my request to surrender my License with New India Assurance Co. Ltd.
Since two months they have been delaying the process, and they are asking for Rs.5000/- to provide a cancellation letter .
There were no such clause during the time I was appointed as Agent in the year 2002, that cancellation of Agency requires a payment of Rs.5000/-.
I have written to them multiple times and also contacted the RO, but they were very rude while interacting .