fastening railing into plaster wall

[Jimmy S.]

What is the best way to fasten railing into plaster walls?  I had them anchored in wall and they were pretty solid but I did not hit a stud. If you really pull on them they moved alittle and wiggled a small amount. (Zoning inspector said it was fine) Well tenants are moving out and the railings are completely ripped off the walls and just hanging there. 2 railing total. They have 2 kids. Should I charge them to fix this and what is the best way to reattached them since they ripped out the 3 anchor bolts on every bracket.  Thanks in advance