Depending on where you live, this could be something you could report to your local radio spectrum regulator.

Usually there are regulations that state your radio devices can't interfere with someone else's. It doesn't matter if they are off-the-shelf type approved devices, you still have to operate them responsibly.

I live in Ireland and there are have a few cases where the local regulator ComReg has intervened when someones wireless networks and devices affected others.