repairs

I have a cellphone contract with Vodafone for 20mnths now and now my blackbery q10 screen doesn't work they don't want to fix it they telling me I must pay r4400 for them to fix it which I don't understand because s still under warranty this is just a ripoff,people u must never have any contracts with them as they don't delive<br> r their promise s mxm ****ed off for ever ,I want to even change their network useless