Using * * * walls to make air-conditioning holes is said by neighbors to violate the property law, right?

Oh, what property law? It's just the wrong law, that is, your air conditioner has a big eye on the public wall. Did you hit the expansion screw or the air conditioning pipe? If it's an expansion wire, it's untenable. If it is a problem with the air-conditioning pipes, under normal circumstances, the neighbors will not look for you, but cut off your air-conditioning pipes directly and think that you have crossed the line. A stubborn person will not let you pretend even if he loses money.

I think you should be the problem of the expansion cable when installing the indoor unit, not the pipe. Have you got any pictures?

In general, when installing a meter box or a cable TV box, it is necessary to inform the owner of the house on the wall and make economic compensation.