You need to submit a support ticket here: https://partner.microsoft.com/en-us/support?stage=1The process take a while as they have many cases to handle. Please try to be patient as they get to your ticket.
You can also read this post on tech community on how to get past a rejected account: https://techcommunity.microsoft.com/t5/partner-compliance-verification/how-to-appeal-a-rejected-partner-profile-in-the-verification/td-p/3834683