Is this a fraud

Hi guys,
Today this number called me +9999012471885513. The person pretended to be Adam I don't know who from London. He was calling from BlueStarStark company or something similar, I didn't get it.
Basicly this guy tried to bulshit me that his company can help me develop my bussiness sky high. He will call back in monday.
Some info about this? And what's with this number. I couldn't find any country code starting with +999.
Help?

Country code +999 was reserved by ITU (as of February 2004 country code listing) for potential use in disaster relief service.

01247 used to be the area code for Bangor in Northern Ireland (which was then moved to 028).

Something strange with that number I am guessing

Wow, I have never seen a 16 digit number before in my life. The largest I have seen even with the 00 prefix is 14 digits

The number was faked/cloaked. Happens all the time when someone is telemarketing.

I'd tell the guy to pound sand if he can't use his legit number on the caller id.