ABN AMRO Credit Card — ABN Charging late fees even cancellation of card request sent and dropped cut card into ABN Drop box

From last 3Years 1 Month, I am requesting to ABN Amro Bank to cancel my credit card but they are not taking my request positively. Now a days, they are saying me that I have some dues and I need to pay, then they will cancel. Actually, I am not getting that why I will pay my dues when I haven't used that card after my cancellation request(24th Feb 2006). This same question I asked them but they informed me that all dues are only due to late fee. But I want to inform you some points -

1. On 24th Feb 2006 I requested ABN Amro customer care executive (by phone and mail) for canceliation of my credit card. But my call was dropped in between and after that I tried 2/3 time then also same thing was happened. Their repsentative asked me about reason and many other thing, I informed her about my problem but she was unable to give me any information. Then I sent a mail to ABN Amro card services.

2. In March first week, they called me on my cell phone and at that time again I told them that I want to cancel my credit card and also asked why the other amount is coming into my bill, but that person was unable to give me complete information.

3. In March I paid all due bills as I requested for cancellation on 24 feb, then again in April new bill was generated, then I called them again and requested very gently that "please cancel my card", and then after also in April I paid bill. Then I felt they are not hearing my voice, and I have to take an action.

4. I went to ABN Amro bank branch at MG Road, Pune and asked about my request status but they told me that for credit cards queries, I can contact them through phone-banking only. And really at that point of time I was totally tensed that why I had taken credit card, I pormised my self not to take any credit card in future.

5. In April Mid I called them again, then they told me that for cancellation you need to cut your credit card into piece and drop that in drop-box with signed application. And according to there instruction I did. But after one month they informed me about my dues of April and May and wanted that I will pay. Then I respond them that I already sent you cut card with signed application, and asked them "How are these dues came?". And they informed me that they didn't get any cut card. In this case what can I do, if they are not getting any envolope from their own drop box.

I have all proofs of whatever communication I did (all mail and written communications). They are using rough language and mentally harashing me. I am completely in pathetic situation. Please help me.