These are usually level threes and they have an appearance of a regular person (character edit at tutorial island, they just push accept). Well, here are some ways that I know to get back at them.
Rune auto bots
These autos are only found around the Varrock Rune Shop. You can easily kill them by dropping rune essence into a house with a mugger inside, and then lock all doors. To keep them there, drop a bunch of rune essence.
Yew auto bots
Same thing except that you either lure them to a high level creature, or do something else. Lure them to skeletons, hobgoblins, whatever will kill them, you can do this by dropping yew logs to the place and then dropping a bunch so that they will stay.
Rune chain
Rune legs
Whip/d skimmy/DDS
sometimes addy full.
They will bury their bones near death. Usually a TB + tangle spell + quick DDS spec is best and fastest