Passion Persian Kittens

I bought a Persian kitten for $739 which included transport costs. I sent the money and they sent me a bill of sale. This morning they were to transport the kitten via airlines and when I asked for flight information they demanded another $919 via western union and when I told them I wouldn't pay it they will not respond to calls, emails or texts and I realized was a scam. While I know I likely can't get my $739 back, I don't want them scamming other people.