Why isn't my fast charger working on my note 4?

[mizmooo x]

I have a Samsung galaxy note 4 which I got last Christmas. A fast charger came with it and it was working fine until a few weeks ago it broke so I was using a different one. It didn't come up with fast charger on my phone but it was a fast charger. So I thought it was just the plug. I brought a new one and it arrived today but it doesn't work either. It's just charging normally not fast. I don't know if it's my phone or the wire or plug. Please tell me tips or what to do.
Thanks!