Amazon delivery scam call asking for OTP from my mom

My mother was given a call by some guy called Sumit Kumar, truecaller showed his as Ammazon Dilevery which obviously off. The guy went on to take my name for an upcoming order then proceeded to ask for the otp received on my mother's number. She did end up telling him the otp but after that she asked me if I had her number linked to my account which isn't the case. I'm honestly super worried and confused on what to do now. I did change my password and my mother's password on both of our amazon accounts and its even weirder because we don't have any amazon subscriptions or bank accounts liked to our phone numbers and we only pay our deliveries in cash.