[paolo]

if someone spoofs your number, don't worry, you will not get charged, ie the calls have to go through the home switch of your telco provider and their CDR records will show this, otherwise, not to worry.

now on the other hand, if you call back some of those numbers, be carefull. I've seen people call 1-876 numbers thinking it was toll free, but they are calling jamaica and other carribean countries with 800-Like area codes, but its an actual billable npa/nxx you are dialing.

so yeah best to just ignore the calls, theres millions of phone customers they will try when they get tired of you.