Cant delete ringtones from iphone 6 plus

Hello,

I have the iphone 6 plus, a new phone not had it long........

I had the recent problem of buying ringtones and them being deleted after phone was turned off and on....

I did the new update and managed to restore all that was lost, but I have the same ring tone four times, which yes I did buy it that many times as at the time I was trying to work out if I had done something wrong..........

all I want to do is to delete the ringtone that I have too many times,

I have tried everything, its bugging me sooooo much, I could rip my hair out!!!!!!!!!!!

Somebody please help me,

thank you,

Vicky.