When the abuse breaks the TOS, report them. If they export you "gimme 1000 gold or I report you" report them, friend them with a slave, and call billing services saying your child was threatened on line for $1000. You will find that the slave will be missing a friend soon.

While your questing and they see you have 4 identical shaman or whatever, and they say "wtf??" and then move on. That's pretty normal and is often cured by targeting them and /cheer or /lol. But remember people are reporting you for cheating all the time, especially at low level and especially if you have serious gold.