What kind of attacks? Did you see the collection for how to defend against and attack spiritual entities like parasites attacking you? Or do you mean in-real-life harassment?
As an absolute basic you (or any mage) should be able to apply the techniques from the book Practical Psychic Self Defense handbook by Robert Bruce, mentions at the very top of the spiritual hygiene tutorial collection for very good reasons - it’s easy, it’s excellently organized and it teaches you important and transferable magickal/energy working skills in plain English.
Since you want chants, You might like this one for Raziel that defends against Spiritual Harassment…
For chants also search on the terms "enn"s and "mantra"s - some people use these terms instead or interchangeably.