To be honest you shouldn't complain.
You did break rules. Ofcourse you're right they should have listened to you but I honestly think the punishment is just right.

You don't stop rulebreakers by breaking rules, means you don't kill someone RDM'ing in spawn - You do an F1 and wait for Staff to handle it.

You don't use big weapons as a class which doesn't allow carrying big weapons.
And on top of that you don't leave in an Admin sit and rejoin right after to avoid getting punished.

Note: reading your text doesn't make clear If you left the first admin sit on purpose or the admin sit finished.
but it doesn't really matter tho.

To be honest you shouldn't complain. You did break rules. Ofcourse you're right they should have listened to you but I honestly think the punishment is just right. You don't stop rulebreakers by breaking rules, means you don't kill someone RDM'ing in spawn - You do an F1 and wait for Staff to handle it. You don't use big weapons as a class which doesn't allow carrying big weapons. And on top of that you don't leave in an Admin sit and rejoin right after to avoid getting punished. Note: reading your text doesn't make clear If you left the first admin sit on purpose or the admin sit finished. but it doesn't really matter tho.