No one answers on my Support Tickets

Indeed. If your given reason is not valid, they'll just state why it's not valid and then reject the request, instead of ignoring it. Rerolls are the most urgent category in the support system, so I doubt anyone's request is purposefully ignored unless it's much more complicated than it should be.

This post says it as if you need to provide an excuse for a reroll, while the valid reasons are already listed on the reroll request page and most of them are not even up to debate. Either it is valid, or it is not.

If the winner was already punished for his not activated wins, support will not punish him twice. It's a little bit confusing because you can not see if a winner was already dealt a punishment for not activated wins. So better be safe than sorry and always report a user with unactivated wins. If support says the user was already dealt with in the past, just move on.

You have a small misconception here, you do not have the right to delete your giveaway, even if you state it in your descriptions.
Only with winner's approval you can initiate a deletion request to support. ;)

The only times you may freely delete a giveaway is with the winner's permission, or if you would already qualify to reroll that giveaway. Staff may, at their discretion, also allow a deletion under certain circumstances, such as when mass revocations occur.

You may reroll if the user is suspended, if the winner has been suspended for non-activation/multi-wins within the past month, if the winner entered the giveaway through illegitimate means, if the winner cannot be contacted for 7 days from the point where you first sent the game (or friend request) to that specific winner, or if the winner owns content within a multi-item giveaway that exceeds what you are willing to allow.

There may also be a few off-the-beaten-path circumstances that aren't coming to mind at the moment.

The point here is, there are a very narrow set of circumstances under which you may reroll or delete giveaways. Support will never permit rerolls or deletions if they do not meet the established reasons for doing such, regardless of what you do or do not include in your giveaway descriptions.

If you want to exclude users from your giveaway based on your own judgment, it has to be done before their entry is put into that giveaway. SGTools.info entry filters or specialized groups are your best resources for supporting such exclusions. [SGT is the only reliable option of the two, but a well-moderated group will at least put the people unwilling to abide by reasonable requests into a very small minority.]

youre welcome!! good luck with your reports =))

Thank you for leaving it open. Our Support team has handled it. As per policy, there will not be no explanation given (such tickets do not allow it), but we still appreciate you calling our attention to the matter.