Order of a Golf Cart

I saw an adverti*****t on OLX for Refurbished Golf Carts. I wanted to order one and dial a Morne Saunders. This person gave me the banking details for the asking price of R8 500.00. On receipt of the proof of payment, she will contact her courier, RapidPort Transport Delivery, to deliver the Cart. I paid the money into her banking account and mailed her the proof of payment. The next moment I received a email from the courier for a further R6200.00 for the delivery on which they will keep the R200.00 and will refund me the R6 000.00. Luckily I didn't pay that also. I think the two people are working together. Morne Saunders and Dr. Thomas. Now, no one is answering their phones. Please be aware!!! Contact number for them are *** and ***