Just be careful going forwards mate. I've just fallen down a Reddit rabbit hole reading a Scammer thread. One of the things they say is once someone has been responsive (especially if they pay) they'll keep trying again and again with different scams. Apparently most are based in Vietnam or Myanmar. I was selling a car a few years ago and someone tried the "oil rig" scam on me. Luckily I found a thread on exactly that and realised what was going on.
Once they move the chat to WhatsApp try video calling them. They generally hang up and after the forth or fifth call in a row they block you
You can probably get a white British Snapchat filter these days to be fair, still wouldn’t trust that
I used to get cold calls about my "interest in the financial markets". They were probably happening weekly for a couple of months, but died off after I stopped answering calls from unknown numbers. I assume they were a similar thing