IRIS an acrimonious break-up

I have been with Iris since 2003. At first it was a very happy relationship but with  the advent of the SQL version- nothing but woes – when I was told  that my biggest bugbear (not being able to use the back-up facility) wasn't due to be fixed until mid 2011 I concluded that 31 Jan 2011 would be the clean-break.   

Anyway sometime in December I told Iris I would not be renewing after tax season 31 Jan 2011.   So January 12th when I noticed they had taken payment up to 31 March 2011 I rang Finance to explain and was promptly told I had to give thirty days notice in writing. I was well miffed this was the first mention of any notice. On Monday I spoke to the rude and arrogant head of customer care to be told ;he would terminate immediately and no refund was due as it is ‘company policy’.   But if I have given the thirty days notice why can’t I have the rest of my money refunded ???