10 GB of Other/Document and Data on my iPhone storage?

There's 10 GB of this Other Data taking up all the space on my phone, leaving me with very little room to keep photos, music and apps.
I have called up apple to help me with this problem but they haven't helped.
So I need to know, the things I can delete to get rid of this, or whether it may be a malfunction in my phone, as I do have 2500 photos on my phone?

Added (1). The problem is that I don't know what "other" is and i need to know what it is so I can delete it

If you want to keep your existing photos, back them up on a memory card before deleting any of them.
Once on a memory card, you can transfer selected photos to another device like a tablet or laptop so you have ready access.

Once you have the back-up, delete any photos, music or apps that you don't use regularly to free up space on your phone.