Curious how you know that?
I've seen it happen as well to friends who have had previously stellar AWS reps that fall off the face of the earth when the ban hammer falls.
His was for "too many returns" when there was a huge scammer ring buying the type of items he was selling and returning bricks in the boxes. Took many weeks to get resolved, and the ban of course shut down everything including his personal accounts, AWS accounts, etc.
Amazon, Google, etc. seem to have decent "happy path" support - but if you fall into either an outlier or stuck into a "bad actor" group you may as well effectively not exist if you can't get traction on social media from the few cases of this I've seen.