pre litigation and harassement

Hello - I am recieving very threatening phone messages on both my cell phone and a friends phone number from a person named Alex Smith from a company called "Pre Litagation Services. This person is saying he will come to my home tomorrow and if I am not at home he will go to my work to serve me some kind of legal paperwork. He left a return phone number 1-877-630-6425. When called it is answered as " Prelitagation Services". When I tried to get information about the reason for the call the person on the phome demanded my social and date of birth before he would provide any information. I'm not sure what planet this guy is on but I did not provide that information. He then told me I was a dead beat and it was a challenge for him to "hunt down people like me"

I can find NO company information on these people other than this site. Can anyone provid any information. Any help and clarification is appreciated.

Thanks to all who took the time to read and respond

NGR