He called, asked me to guess, confirmed when I mentioned a name. Said he changed his number, texted next day about updating DBS number. Advised him to do it in the app. Later, he messaged, messed up twice, now locked out. Then, requested $2800 for PayNow to 8616173?. Verified with friends, confirmed scam—voice mail didn't match our mutual friend. Didn't proceed with payment.