I was in a similar situation with MBNA back in October,
I had a card with them for 12 years, with the original limit of 4,000.
I had brought it down to a balance of 400, and I rang them up, asked to speak with a team leader / supervisor, as my situation had changed, and I wanted to pay off the 400 balance.
I asked her if they would accept 51%, or EUR200, as that was my monthly disposable income at the time,
She insisted I did a basic statement of means over the phone with her, and while she accepted that I wasn't lying about my situation, she wouldn't accept the offer of EUR200, and said that they can "Sell On" the debt for 75% of it's original value, so they would get more by selling it on,
I had the debt for 12 years, average balance of 3000, with an APR of 18% - I asked her if she had any idea of the amount of money MBNA had already made from me, not only through interest, but with over the limit fee's, and late payment fee's etc, and she couldn't care less,
So I left the balance there and told them not to contact me by phone or by text message
Sean