[Resolved]  Citibank Credit Card — Disturbing calls as reminder

I hold two citibank credit card ([protected] & [protected]) and my usual payment due date is around 16th of every month. I usually drop the cheques everymonth in a manner so that they get cleared on every payment due date. But surprisingly the reminder calling system (as the Citibank name so) from various franchisies under Citibank start calling me as soon as the statement is generated i.e. almost 20 days before. That's not an issue though. The real issue is they call everyday unless and until the due date arives and they have the information of payment clearance. It is much more annyoing to note that everytime a new executive from their end start asking the same questions and I am bound to reply the same answer. Just think about the stupidity! Further these disturbs daily works a lot. Think, when I am at my boss's chamber, the bloody call rings up, and so many matters of such annyoances.

I lodged so many complaints through email and over phone times without number, but no solution till date except bluff & assurances.

I need help to guide me properly on how to stop such irresponsible disturbing calls.