When a girl from citibank called me to take personal loan @ 24% p.a. I offered her the same at 18% and she said sir mujhe nahin chahiye . When I asked her to mujhe kya chahiye tha jo apne call kiya. From that day I never got a call from citibank. Similarly I was called from ABN AMRO for Credit card,I was in Night shift and sleeping at home in daytime when they called. I told them politely to plz not disturb as I am sleeping but I got two more calls and next day two another from the same no. to ask if I made up my mind It was a cell no. Next night I called at that no. at 2:30 am from office and asked the person " Sir you called me in the day but I was busy, now I am free so please describe me in detail your offer for the Credit card." He requested me to talk in morning but I insisted for it. After about 5 minutes he got irritated and yelled Sir ye koi time hai aap mujhe sone nahin de rahe. Then I said," I am trying to explian this to you for last two days now you understand how it feels so dont call me again or I will call you daily as I am in night shift for this whole month." This worked for me, You can try also