I got a call from a scammer claiming to be an officer of something from the CRA. How can I mess with them?

I got a call last week and they left a message. I called back from a blocked number, curious as to what they would say. No one answered. I tried calling back with my ID spoofed and again no one answered. I think I called back one more time from my number, but again no one answered.

I got another call today with a message again claiming to be an officer with a new number to call back, asking to call or have my attorney call.

I'm wondering what is the best way to mess with them. I have a lot of time on my hand, but I don't really want my phone called all the time.