How to deal with someone messing you about

So I was at a wedding yesterday and when I first walked in I seen 'Jay' sitting with his uncle, I shook his hand.

5 hours later, Jay asked me 'I want to talk to you', I was surprised suddenly he wanted to talk to me, when didn't he talk to me when I seen him 5 hours earlier. He asked me to come here and said

"someone has invited you for a wedding" "how can I get your mobile number" why does he need my mobile number? Why can't he ask me for my landline number or give a email of the invitation or ask the person who's invited take a photo of the wedding invitation and then send a photo to my phone?

Then his friend who's called "d" sitting next to him said "someone has invited you to a wedding".

Jay went on to further ask how can I get your mobile number?

I feel they are messing me about and also they have malicious intentions, since I'm on Facebook and perhaps, put my mobile number on a escort site with my photo? Or do some prank.

What are your thoughts? If he's going to invite me to a wedding, tell my dad, not me.

Anyone? What do you make of this? Especially when they said, can you give me your mobile number, where can I get your mobile number from?