how to make my dad agree to buy me and xbox 360?

one month ago my ipad mini turned off and its not turning on again,so i sold my xbox to dad he gived me 250$ so i gived the xbox to him to sell it cus i need this money for buying ipad 4 so now ilove this gta v 5 and ihave this ipad 4 and someone told me that ipad mini will repair for only 25$$ so i said :dad ill give u the ipad mini but give me back my xbox so he said no now how can i make him agree?