Citi Bank Diners Club

I was informed by Diners Club that the Diners Award points that I had accumulated over the last 8 years have been forfeited when my company closed my corporate diners club card (Citi Bank). I had joined the awards program on my own and was paying $75/yr since 2000 and had accumulated about 180,000 points. Diners is saying that they had no responsibility to inform/warn me of the pending forfeiture and that this was my company's responsibility. I disagree in that I joined the awards program on my own and my company had nothing to do with the award program. At the very least, Citi/Diners had a responsibility to notify me of the pending loss of points. I last payed my Diners award membership fee for the year back in October of 2007 which was for the entire year. This is a very poor way to treat customers/people. I have nowhere to turn to as they are refusing to do anything about this saying that I should have read the fine print when I joined the awards club.