rental issues

everything has been going so well lately that of course there had to be a problem with the rental property...  here's what seems to have happened: the pipes got backed up and so the renter called a plumber.  they came and rooted down the toilet but it didn't help at all.  the renter called me and I got the plumber I trust to come in and take care of it.  he did, but by then the damage was done.  some of the waste water had backed up into the place and got pretty nasty.  we got the whole thing taken care of (other than some cleaning), or so I thought...  the renter on the other side wasn't home the weekend this happened.  when he came home he found quite a surprise: his bathroom was covered in sewer platter!  he was super mad when he called to let me know.  I headed down there to try and get to the bottom of this.  turns out, the first plumber thought it would be a good idea to root through the toilet, but here's the problem: the pipe for the toilet is a straight pipe connection with the toilet on the other rental side.  that means that the rooter just went in one toilet and out the other.  as soon as they turned on the spinner blades, they totally destroyed the toilet on the other side, splattering all the waste everywhere!  ugh.  I replaced the toilet, cleaned the bathroom hazmat style, and got it all taken care of.  there were some angry renters, but I finally solved the issue.  well, solved that problem anyway...  about two days later the water heater and furnace gave out.  of course.  so we had to get someone to come in and replace both of them.  so much for making any money on this place this year...  we have got to get rid of this place.