Contant ringtones

[AC Question]

When i try to set a certain ringtone to a contact of my choice it still wont letme after telling me to put them on my internal memory/storage which took my hours to do znd to find out it still didn't work this phone cost £400 and to say i can't get any help i think it is rediculous. Sony made this phone but yet cannot solve a problem like this which should be easy to answer seem so they are the makers of this phone.