bitcoin millions fatuds by nigerian in india

my brother had invested few thousands first 3000 for 10000 in return for greedy which was not given backnagain 4000 demanded yhennsaidnur amount to 35888 which requires processing fees of 4000 after processing fees again.then they kept on giving different upi to pay within 3 minutes or they were delet ed which means muke accounts are used to rout the amount and withdraw and then stop responding to my whatsup pr email or calls