how can I repair my fridge temperature?

I've got a Mistral Hotpoint Fridge Freezer and the fridge is not cool at all and temperature is set at 24 degrees and I'm unable to reduce it. I've lost my instructions and would be most grateful if you could help me please My freezer seems to be working and the fridge light is coming on but I'm unable to use the fridge. My e-mail address is Victoria.Bell@finance.sefton.gov.uk could you please use upper case for the initials as the reply will not get to me otherwise, you can also contact me on fingerlessmitts@yahoo.co.uk. thanks.