Reviews have been removed on all my Branded ASINs

Hello

I am facing an issue from 10 days. The reviews on my all listings (under my own registered Brand) are keep on disappearing without any violation or may be detected in error but no notification received regarding any violation. Can anybody know how to contact product review team or relevant team through email because seller support is not responding according to expectations. My 1600 review have been removed with in 10 days of one variation listings other listings are besides. Can anybody please mention the emails for relevant team so that i can get resolution as soon as possible. My total sale has been droped.

Thanks