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Well you broke their rules by opening an illegal underage account so they aren't keen on you having another account if you take their rules so glibly.
However once the account was limited you would have had to ask customer services if they would allow you to open another account as you are now of age, but you didn't you just opened another one and so broke their rules again when you were 18.
Your only hope is to contact and ask if you can open another one as you are now over 18.