Can walnut programming harass the phone and call the police?

Of course. According to Article 18 of the Regulations on the Management of Communication Short Message Service issued by the Ministry of Industry and Information Technology, short message service providers and short message content providers may not send commercial short messages to users without their consent or request. If the user explicitly refuses to receive commercial short messages after agreeing, it shall stop sending. If you continue to send harassing phone messages, you can go to the public security organ to report to the police.