colour pencils nibs breaking off

Hello I would like to express my dissatisfaction with regards to your colour pencils.My daughter has only had them for a few weeks since school started in January and they are already short, everytime she sharpens them the nibs break off.For the amount of money one spends on the brand I would expect much better quality. This has been such a waste of money for me as i now have to purchase colour pencils again and term one has not even ended.