[mothered]

But they really check for weight?

Yes.

Weights & dimensions are stored for record keeping and cost of freight, and cross-checked during Investigations.

On my iphone-try the package was really damaged. there was an 8-10 inch hole, where u can really grab the phone out off. But with this, amazon still refused to refund something.

What was the reason for the declined claim?

I didnt changed anything and i cant localize if they really blacklist/redflagged me

If any of the events above took place, you would've known at the time It happened.

On refund/item loss request, they want always a couple of question answered and delivered to their investigation email.
After this, they refund. I think it's possible, that someone checked this multiple emails and saw the matches between?

I don't know the entire Incidents of your SE, so I cannot comment on It.

But i still dont understand, why i can create, buy and get the item, when im flagged?!

You can still make purchases on a flagged account.

It's when your start SEing that's of concern.