Scam

Description

Selling a phone via Facebook Marketplace. Agreed price with a guy – he asked me to send him a PP payment request for the amount – which I did.
Email confirm from PP address with a Transaction ID on it.
Email an hour later from post.cz email address saying I have a payment. Payment will be transferred when I respond with valid tracking details. Email has a different transaction ID…….I think I’m being scammed.
So I put the phone in the post – once I do I can’t stop it. Payment never arrives?
Any input would be welcome. Thx