I try to have fun with the scam callers because no one else calls my phone.
I usually answer in Spanish, with an aggressive tone.
On occasion they switch to a Spanish speaking attendant and ask if they have reached the number they dialed. Lily Tomlin skits come to mind.
"Have I reached the number which I am calling?"
I usually ask if their Mother knows what you are doing.
The Matriarch is a profound influence in Latin American family structure. That sets them back some, but I then ask if they even know who their grandfather is. Two of the most devastating insults I can offer to these assholes.
Now, understand that it has been thirty years since I lived in south Texas and had need to use educated and respectable grammar, instead of straight up "pocho," so my Spanish has suffered from lack of use these days, but I can still annoy the callers and impress the local Mexican market place keepers by speaking to them about mundane daily things in their native language with fine aplomb.
I can have a lot of "fun" with telemarketers by bringing to talk back around to what their Mother would think of what they are doing to people.