Unverified customer review's - Can I ask AZ to delete it?

Hi,

If customer review is marked as “Verified Purchase” - that is legit review.
But sometimes there is no such marking, so it means it was left by a customer who never bought this product on amazon.

Some time ago I asked amazon to delete such review and they did it.
But now they refused to delete it.

Maybe something chaged and now it’s no longer possible to ask to delete “unverified” review?