So what's going on

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I am selling toothbrush holder which is the picture. I received 7 people wants to buy but they want to do on whatsapp which I don't have. Yesterday I went to the shop to get on whatsapp. Later they email me a email saying they had paid me RM600 for a RM10 toothbrush holder and ask me to refund back RM590 to them. So I think its a scam.