Call and have the telephone/ internet disconnected two months ahead of time.
This prank works through the framework of the service provider. The customer service lines regularly take disconnection calls, and by placing it well ahead of time, should work to support this idea.
The best time to use this prank is when leaving an employer. No one will suspect you if you no longer work there. Feel free to test and see if the telephone lines are down on the day requested. This prank will give the impression that the company is no longer in business.
In a reversal of this prank, you can also call ahead for new services to start. ensure the services do not require installation. The company will therefore not know they are being charged until the invoice arrives.