What is a boxing infraction?

[Tecmos Deception]

You wouldn't actually be able to log in two accounts from the same IP without an IP exemption. To get in trouble for boxing you were either using an IP exemption and a guide observed you and decided you were using two accounts but without actually being two separate people. Or maybe you used a software option or tethered a second PC to a cell phone's signal to play two accounts at once and someone noticed. Or something like that.

If you really never did, try to put a petition in the petition forum saying that you've been wrongly accused/punished.