Can´t log on Nintendo eshop, Miiverse, etc

Hi, my Nintendo 3DS XL cant log on the nintendo eshop,miiverse, theme shop, I get the error code "022-2501 you cannot Use this Nintendo Network ID on this system", then I formated my 3DS, but when I try to link my ID I get the error "022-2591 This Nintendo Network ID has already been linked to another system in the nintendo 3ds family" what do I need to do ? thanks in advance