mistreat    guhahaza, guhama, gusīnda
En-En dictionary 
gusīndira (-sīndiye)     v    1. to scold, 2. to insult, 3. to mistreat
guhahaza (-hahajije)   v    1. to rule over, to dominate, 2. to mistreat, to oppress
guhama (-hamye)   v    1. to hate very strongly, 2. to be mean to, to mistreat, 3. to persecute
gusīnda (-sīnze)     v    1. to bully, 2. to mistreat, 3. to vex, to annoy
kuzizwa (-zijijwe)   v    to be mistreated because of