How to get my ringtones back on my iphone?

I reset my phone yesterday and I lost my ringtones that were purchased through the itunes store is there anyway to re-download them. When I plug my phone in itunes says 0 ringtones

I managed to do it by syncing my iPhone to iTunes. I then went to Ringtones in the iPhone sync page, Ringtones section. I unsync'd sll if them, applied the changes and then re-sync'd them. The timer at the top said downloading them and they were there.