Trenitalia phone number

In the past I was having touble with the Trenitalia site, I was given a direct number from Paul. I called and they were very helpful, even called me back with more information. In addition to booking the fast train from Florence to Venice they took the time to give me the best times, number and routes for the regional trains. It then was easy to go to the Rome station and buy the best regional ticket to Assisi....all said I didn't keep the number