Recently purchased charactar BUG

Hello. Recently bought a 70 Shaman through the website, and EVERYTIME i'm in a Battleground it keeps spamming ''demonic sorankar parn zennshinagas'' or something like that in the Battleground chat. Multiple timses!! Here's a link: https://imgur.com/a/op01a

I already got a response through the in-game ticket system, which told me to delete cache/WTF folder which i did, but it still keeps spamming. I have no auto-talk addons, and ive never seen it before on my other/old characters. My guess is that its connected to the old owner, but i have no idea how.