If you keep having unwanted visits from a particular person, you may use Four Thieves Vinegar to get rid of them.
Get some new salt and dampen it with Four Thieves Vinegar. Put it away until the annoying person comes around again, then as they are leaving your home, sprinkle some of the treated salt behind their back, but do not let them catch you doing so.
Carry some of the treated salt with you so that you can do the same thing, if you run up against that person while you are out and about. After each application of the new salt the visits will become increasingly more distant from each other until they finally cease all together.
Another more common way to move a person out of your life is to write their full name on a piece of parchment, get a small jar and put the parchment inside. Fill the jar with Four Thieves Vinegar and then seal it tightly. Take it to a body of fast-moving water which flows away from where you are and toss the jar into the water. As the water takes the jar, so will the person be taken from your life.