SOS~~one question about the local school policy ,or local law

I am a expatriate, my child is studying in a local primary school in pre-primary class, we paid the book material fee for the whole year 2013 . now ,i want transfer to another school which is much suit my baby, but the school headteacher forced me pay the school fee for the rest of 2013 (6mouths rest~~God bless me) even though we don't go to their school anymore, otherwise ,they will complain to immigration office . that really scared me~~~, but half years' school fee is a big deal for my understanding for i won't take any benefit from school in the coming months,why should i pay responsibility which doesn't belongs to me? Is that legal for the school?

firstly ,i really respect to everybody in this beautiful island, i am legal person, i don't wanna make conflict  with anybody, i don't wanna make troubles. so ,if the law in Mauritius says i must pay, okay, i will, but if not, i don't wanna be cheated ,that's not fear!

thank you in advance