Atm, the only real thing I've found was to bypass the ban ( 002-0102, which most of the people are getting ) is by injecting a fresh LocalFriendCodeSeed_B through Decrypt9.
The only problem with this however is that if too many people use this seed, if one person gets banned, EVERYONE who uses the same seed will get banned.
Also, getting banned from online services is like one of the lightest punishments Nintendo could've given.
They could've sent Nintendo-Ninjas for crying out loud.
Like chill, 15 day ban, you can live.
Don't complain. You went online and brought it upon yourselves.