My account was frozen too, i think it was because i have de same IP adress of the account of my sister, and her account was frozen too. Did someone give me an advice please? I've sent an email to neopets team.
I'm not sure if you can get frozen for that. I have two other side accounts, and my brother has a main and one ex-side (never disabled it). That counts to a total of 2 mains, and 3 side accounts. My brother has been playing longer than me, and I started my first in last January. I haven't been frozen yet for anything (nor that I should - 2 different people).
Some advice: Try to remember what you did in the past week. Did you do anything that might look suspicious? Did you break a rule that you didn't know? Did you play Hot Dog Hero? (several people have been frozen from that game- more info
here)