Thanks guys , i read thru what @songdotech wrote, and it worked, then i later discovered that my wordpress files/pages were being replaced by the hacker. so i changed it back.
Before that day i previously installed 4 RSS plugins after that then i got hacked.
As soon as i confirm the one RSS plugin i got hacked from, i shall post it here to prevent others from installing it.
Anyway working on how to Hardening WordPress now.