Removal of unwanted entities

how would i go about removing an entity that refuses to leave my body, the correct way?

If you are dedicated it is highly unlikely there are any entities in your body. Perform a banishing ritual, ask for help from the Gods.

What makes you think you have an entity in your body?

Is possible that you have links in some of your chakras, try vibrating the Thaur rune in your chakras and make an affirmation like: "the energies of the Thaur rune are removing each and every parasitic connections and links".