I'm living in Caracas, Venezuela, South America.
I think you should try to write in English to:
UFFICIO ANAGRAFICO DELLA PROVINCIA DI POTENZA / ITALIA
Asking for "dati anagrafici" of your relatives.
Without to send money.
I think they should answer to you.
You could try to find out a "COMITES", an Italian Committee established in your Country. They could help you to search your Italian origins.