Amazon In — my account has been hacked but no adequate response from amazon team to resolve the issue

Dear team,

I am amazon prime subscriber, recently my amazon account has been hacked and i don't have further access of my account from 09/07/2020. For every setting purpose an otp is being sent to a mobile number which is totally an unknown, i haven't changed my personal mobile number yet but without my concern the mobile number has changed. I am trying hard to raised complain to amazon team but there is no suitable email address or phone number so i can raised my complain. I have put my phone number in the website so they can call me but i have received call from their us/ uk team and they can't resolve this issue. Amazon india's customer team is ineffective / inefficient. I am facing this from issue last couple of days. Thus requesting for your urgent help as its regarding security purpose.