My account name is already registered

Hey. There's some problem in the system. So, somebody created an account with my account name. e.g. wanted to create multiple accounts for some banks, and i got error message creating it. My account name is "A", email is "AA";second account: "B";email is similar. Can you compare these details with the "C" and "D" accounts also IP addresses if possible, please. I can't get activation emails, can't login, can't register with it because it says it is already registered. Honestly, i can't even remember creating "C" and "D" accounts. A reply is highly appreciated. Thanks, have a good day!