What ticket should i be using?

Multiple wins for the same game.
If someone won only 1 time a game, but re-gifted it, Not activating won gift.
Also, you can write in the description all his/her infractions.

user reports will just pile up, there are over 30.000 now.

best way to report is to MAKE giveaways and reroll winners. hunting people on sg doesn't work.

if you are asking for reroll, use that. doesn't matter the reason much. choose whatever fits the most iyo

if you are just reporting users, choose user report.

anyway, support might take a while to answer