Yes Bhai, this is Pakistan, and frauds may also happen with customers even after paying thru PO. Nevertheless, I would still insist on taking delivery only once they have given you the invoice in your name in softcopy at least (like they sent me via email). Believe me, you would avoid so many unexpected technical glitches in future by following this simple advice today. Do ask the dealership to get the PO photocopied, stamped, and signed by them, so you have proof of handing over PO to that specific dealership.