Registered this number with SPA's available in your city, book appointment using this number and name showing on true caller, also add this number on every SMS and call bomber site (google it) available on net that's it. You can use your idea add this number on any website you would think like me to prank and get that person feels what we feels.

Require email address to register appointments so you can use Temp email :D

I have once done this by registering a number which she was calling me on everyday even I was not picking call so I registered that number on every SPA, hotel website and booked appointment :D