A little late now to say obviously, but a cheap punting phone never your own number, I've forgotten mine on occasion and gone off to a meet, just to abandon the idea as would never use my own phone.
I'd also never pay anyone as it usually doesn't stop there after they have you on the hook.
Call the police get it reported and on Facebook deny any knowledge blocking them and making your profile private, your friends won't notice the lock down on your profile.
Lastly transferring money leaves a trail, cash on deliver only.
This is a very risky game we play and safety at all times, I don't even give the WG's my real name when we meet, even this forum I only do via a hidden and passworded Ipad, I don't even do AW on my 'real' phone incase the o/h picks it up and I've forgot to clear the browsing history, that way I've nothing to hide it would appear