Not really an account issue. Having a similar name is also not technically a break of site policies or rules. It is entirely up to you to make sure your 'customers' can identify you quickly and easily, not us. We're not a marketing firm, nor do we hold names in trademark; so I am unsure on how to address your second concern. Unless they actually try and impersonate you in a post, have an insulting name with yours involved, or claim to be you, nothing we can do about it. I'll leave this open in case you wish to take this up with the site owner, but will move to general help.