If YOU EVER CALL THESE NUMBERS BACK
Dial *67 FIRST then the phone number!!!
It will block your phone number from them.
If you get a machine/Robo message then its a scam
If a real (non telemarketer) person answers you can carry on.
Or if a legitamite sounding voicemail answers then you can call back UNBLOCKED (as some people won't answer a 'number' blocked call)
As tempting as it is, do not call the number back. Once you contact them, they will have a record of your call and they can say you are conducting business with them and they will hound you to death.
Called them back tried to get my credit card number managed to keep these scammers on phone for happy an hour fun then they blocked my number fun though please do the same and your friends too