[xQx]

Call one of your friends in the country who has a chainsaw and a trailer. Cut it up enough that you can load it onto the trailer.

Wait until night-time, then go and dump it on the doorstep of the property management company.

Problem solved.

Edit: I see Joekerr also suggested this approach. I wholeheartedly support his suggestion.

Fair enough if the property management company look at the problem and say "sorry, law's on our side, you deal with it"; but if they're not answering your inquiries or the tenants inquiries, then take the problem to them in a way they can't ignore it.

Professional property managers are the scum of the earth. I haven't met one who isn't a shining example of the fact that some people are only alive because it's illegal to kill them.