Banned account for Nostalrius

Hello,
I got my cousins account plus my account banned permanently for playing both account at same time, I didn't know about the rule and I want at least if is possible to remove the permanently account ban to my cousins account because he didn't know about what I did.
You can check by IP connections that one account is from Spain and the other is from Canada, so we are 2 different person.
Also this is the 1st and last time this is going to happen and the mistake is mine, not of the other person.
I politely ask you to remove the permaBan on the character Darkmoor on server Nostalrius PvP.
I understand that the character Tadorm on server Nostalrius PvP stays with the PermaBAN as I am the 1 who commit this severe mistake.
Pd: I read also about the account sharing, but in some cases its not fair to apply this, if my girlfriend creates and account to play with me and I create this account for her, in that case I will know 2 account, it is not fair to ban us for that, as if I know an account of a family member of mine.
Pd2: You also can see by the chat logs with the GM, that I have been polite and didn't try to negate anything, because I didn't know about that rule.
Thank you so much for your time and understanding.
I got my cousins account plus my account banned permanently for playing both account at same time, I didn't know about the rule and I want at least if is possible to remove the permanently account ban to my cousins account because he didn't know about what I did.
You can check by IP connections that one account is from Spain and the other is from Canada, so we are 2 different person.
Also this is the 1st and last time this is going to happen and the mistake is mine, not of the other person.
I politely ask you to remove the permaBan on the character Darkmoor on server Nostalrius PvP.
I understand that the character Tadorm on server Nostalrius PvP stays with the PermaBAN as I am the 1 who commit this severe mistake.
Pd: I read also about the account sharing, but in some cases its not fair to apply this, if my girlfriend creates and account to play with me and I create this account for her, in that case I will know 2 account, it is not fair to ban us for that, as if I know an account of a family member of mine.
Pd2: You also can see by the chat logs with the GM, that I have been polite and didn't try to negate anything, because I didn't know about that rule.
Thank you so much for your time and understanding.