Misc Two NNID in the same 3DS? Help xdd

[KamikazeEsp]

Sorry for my English if there is any mistake

Some time ago, did some DSiWareHax for softmodding a 3DS XL. Before that, I 'unlink' my NNID from my 3DS by modifying data from CTRNAND ('Removing a NNID without formatting your device' https://3ds.guide/troubleshooting), so I thought there was no NNID linked...
I did the System Transfer: neither NNID on my 3ds, nor in the 3ds xl. Now, I want to link my NNID on my 3ds but it says it is linked in other system.
Today I called Nintendo Client Support and they say that NNID is linked to a 3ds xl, although there is other NNID in that 3ds xl...
What can I do?

 

[mrjc1238]

I think you can just tell them you lost that 3ds and want your id transferred to the one you want it on.