@Sethbala11 @Abigael @akinlolu99 @Kunkun
Oops, four of you answered on the same day. so I try to give a unique answer for all of you.
So, I had not said it but the same situation had repeated during this period of time more than once (I posted this thread on January 31), but with phone calls from all over my country (Italy), even if made by different people from different companies (probably non-existent).
But...the concept was always exactly the same! This means that always I would have to pay in advance!
For this, if before I had some doubt that that was a scam, well now the answer is more than obvious.