I had the same thing happen about 3 weeks ago. I did a PM to a seller asking the price on a gun stock. A few minutes later I get a text saying $120. I paid it with PayPal F&F.
Then he texts about the rifle action (also in the ad) and we came to terms on the price after a back & forth. That was $500, paid the same way. $620 gone.
Questions on site security:
1) how did he hack into the site to get my phone number to text me?
2) how was he able to know that I just PM'd a person about a specific item?
The person was American based on his use of words, no typos, excellent grammar, etc. I summarized what happened & emailed it to this website but never got a reply. I've changed the site password, but am sure it makes no difference.
Never respond to a text unless you have given your phone # to the party. It's a scam! All hackers should be… disposed of.