Fast city courier SCAM

SCAM!!!please do not fall for it. The say they ship dog breeds. We were looking to buy a dog and payed a deposit on our dog. The following day we received an email from Fast city couriers saying we need to pay a refundable deposit of R6000 on a temperature controled crate. We asked the people that we were buying the dog from Vanessa-Kay Eveleigh and they stopped answering us on email and cellphone.