Citibank Credit Card — unnecessarily showing pending amount

Address:

Delhi

This is a long pending credit card since 2005. Though i made all the payments which were actually the interest being leived for on some annual charges. Despite the fact that they took the amount in few EMIs they are still sending me letters with pending amount.
As promised they have not yet given me NOC, infact have been harassing me with more pending amount.

It is a request to please get this sorted.

Regards.