Nursery Fees Increased by 40%

My DD is at nursery 3 mornings a week, we were told on the 9th of August that her fees would increase from £28 to £40 per day from the 1st of Sep (Over 40%!!). This is a £160 a month increase to us, and one that we can't afford. I only found out about the increase in person the week before they were due to rise when I was handed a print out. We had been on holiday over seas when the newsletter was sent on the 9th of August, so it wasn't read (it's normally about light things such as world book day and things like that!). I would like to know what options I have. I have already found her another nursery to attend. I did ask the nursery to honour our prices until then end of the month but they said no. Can I pull her from the nursery and expect the balance that I have paid returned. I was not given the option at the time to remove her from their care, but had I been given it I would have. It feel so wrong that such a huge increase could be applied without giving the parents any options. If any one has any advice I'd greatly appreciate it.