zanussi fridgefreezer cold freezer but not in fridge,zk 57/38r?

the fridge section of our ZK57/38R (at the top) is not getting cold even with the stat turned up full to 6,but the freezer section (bottom) is icing up, but i dont know it getting cold enough. the product number ends in 01 but we dont know how old it is , cant really afford to spend too much on it hope it might be something simple , be greatful for any advice.thanks.