Now, only do this if someone has really wronged you as it can become pretty unbearable..
I stumbled across this, by accidentally getting caught out by this scam a while ago.
The thing is once you submit a phone number(mobile only) they will continue to ring someone 30+ times a days, which will slowly decline over 3 months at all hours.
All you need is someone's name, email and most importantly mobile phone number, with the area code.
I'd highly recommend using a VPN service for this as a just in case…
This site is a complete scam, looks legit and has been operating for a few years, but is very useful in pissing people off, whilst they will have no idea about who's done this to them…
Good luck