Nee fraud

I got a whatsapp msg and call from [PHONE]. He called me by my brother's name who were colleagues at Tanzania. His name showed Balu BOI. I attended WhatsApp call. He called my brother's name. I told I sm younger brother. He immediately told my name. When I asked how He got my number, he replied my brother gave long back to fix house on rent. I believed and gave my brother's number. Then he called my brother. Talked to him. He told my brother he will remit large amount and told my brother to transfer to his son. My brother realised scam and blocked his number and informed me also.