Don't be fooled

I bought puppy Milly from Pet Finder SA - R4500 including shipping. On the day of the shipment along with my tracking number I received an email from Star Express asking for an additional R16500 to be paid R16000 would be refunded when the puppy is delivered. Claiming this is for the Crate - I found it very suspicious and was met with great resistance when I indicated I would like to back out of the transaction. I'm currently reporting the issue with Mastercards Fraud Department.